Canon RF 600mm F11 IS STM Lens Review

Canon RF 600mm F11 IS STM Lens

The Canon RF 600mm F11 IS STM Lens is a small, light, affordable lens with a long super-telephoto focal length that is ideal for wildlife and big field sports. The narrow aperture is this lens's biggest drawback.

  • Optimal focal length for birds and wildlife
  • Affordable
  • Quiet optical image stabilization
  • Mid-sized
  • Lightweight
  • Compatible with RF extenders
  • Retracting design
  • Narrow fixed aperture
  • Mediocre image quality
  • Low maximum magnification
In-Depth Review

Never did I think I would be writing a review of a Canon 600mm lens with a fixed f/11 aperture, and "Who is going to want this lens?" was the first question I pondered when learning about it. Image stabilization and Canon's STM AF seemed a good combination, and after reviewing the size, weight, and price of this lens, my heart warmed ... significantly. While this lens is not the right option for all serious wildlife and sports photographers, it opens a new world to those who need a lightweight, compact, very-affordable long super-telephoto lens. Because of its accessibility, this lens will capture images that otherwise would go uncaptured.

Canon RF 600mm F11 IS STM Lens Top View

Focal Length

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While this lens has some nice features, it is the 600mm super-telephoto focal length that should especially grab your attention. For the lens to be useful, the angle of view provided by the focal length must work for you. Note that, despite the small size and low cost of this lens, the RF 600 provides the same angle of view similar as all of the other 600mm lenses. What is the 600mm focal length's narrow angle of view commonly used for?

When you need to frame a subject tightly and can't get closer, due to:

  • physical barriers (streams, cliffs, fences, etc.)
  • legislated barriers (lines on a field, property boundaries, etc.)
  • a subject that does not tolerate closer photographers (skittish birds, for example)
  • impacting subject behavior (such as the natural activity of wildlife)
  • safety reasons (dangerous wildlife, high-speed vehicles, etc.)
  • stealth requirements (such as for law enforcement missions)
  • a requirement to avoid being a viewing obstruction (such as getting in front of the audience at a venue)

— you might need a 600mm lens, and, if this lens's f/11 aperture suits your need (more about that later), the RF 600mm lens might be the right choice.

If you simply don't want to get closer, a 600mm lens might be just right. Sit in the comfort of your car, avoid the need to cross a creek, stay back from the surf, stay out of view, etc.

When you want to capture a compressed look from a distant perspective, you might want a 600mm lens. When you want to create a strong background blur, isolating a subject from an otherwise-distracting background, a 600mm lens might be precisely the one you need (though the narrow f/11 aperture is not helpful in this regard).

While a 600mm lens has a wide variety of uses, wildlife and sports are at the top of the most-frequently-used-for list with most other 600mm uses occurring at a far lower frequency. When using a camera with a full-frame imaging sensor, a 600mm lens has long been my first choice for wildlife photography. Subjects ranging from small birds up to large game are readily captured with this focal length. The light weight of this lens, along with the long focal length, makes it a good choice even for birds-in-flight.

When using a camera with a full-frame imaging sensor, a 600mm lens has long been my first choice for field sports photography, including soccer and some running events. This focal length is an excellent choice for baseball, football, surfing, and a host of other sports.

Photojournalists and others covering events will love this lens's reach. When photographers covering events are not permitted close access to their subjects, including at concerts, speaking events, etc., this focal length will often provide the reach needed. This lens is a great choice for photographing air shows, especially when single aircraft are flying. Many details are ideal for capturing with the 600mm angle of view.

Canon RF 600mm F11 IS STM Lens Backlit Lotus Sample Picture

As I write this review, Canon RF lenses are not compatible with any cameras having an APS-C-sized imaging sensor. Should this lens someday become compatible with an APS-C model, the 1.6x FOVCF sensor format will see an angle of view similar to a full-frame-mounted 960mm lens. This much narrower angle of view diminishes the number of scenarios this lens is ideally suited for. I rarely hear a bird photographer complaining about having too much focal length, and distant wildlife often can make full use of this focal length. This narrow angle of view is challenging to use at many sports events (keeping a moving subject in this angle of view is difficult), and this angle of view is even too long for some wildlife photography. Moving back can be an answer, but obstacles can get in the sight path, and a longer subject distance means that heatwaves are more likely to be an issue.

While on the heatwaves topic: just because you have a 600mm lens doesn't mean that you can create sharp images with it, even when using the fastest shutter speeds and best techniques. When present, heat shimmer/haze/waves will create optical distortion that will diminish the quality of long-distance-captured photos, and I encounter this issue with some frequency when using 600mm lenses. Artificial turf sports fields are among the worst venues for heatwaves — sun on artificial turf ensures terrible 600mm image quality.

Here is an example of the 300-600mm focal length range captured by a zoom lens (the 600mm sample might be a slightly wider angle of view than it should be) as seen by a full-frame camera:

Sigma 150-600mm OS Sports Lens Focal Length Range Example

I will share a focal length comparison that includes the RF 800mm lens later in the review.

Canon RF 600mm F11 IS STM Lens Sunset Sample Picture

Want to add some color to your portfolio? Just direct this lens at an even modestly colorful sky just after sunset or just before sunrise (never look at the sun through a telephoto lens unless an adequate solar filter is being used).

Canon RF 600mm F11 IS STM Lens Crescent Moon Sample Picture

This lens is an excellent option for photographing the moon, an especially bright subject when in direct sunlight.

Canon RF 600mm F11 IS STM Lens Front View

Max Aperture

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F/8 and be there? Not with this lens. What is the Canon RF 600mm F11 IS STM Lens's biggest weakness? Few will argue that the fixed f/11 aperture is the answer to that question. Fixed? Correct.

Affordability and light weight were primary goals behind this lens design. Removing the aperture blades and motor mechanism saves cost and weight. A round opening that equates to f/11, a narrow aperture, is provided. A narrow aperture requires significantly smaller lens element diameters and overall body size, which results in lower cost and lighter weight.

Canon's R-series mirrorless interchangeable lens cameras provide clean high ISO images. That is important, because if the subject is moving, expect to be frequently reaching for those high settings. Figure roughly f/11, 1/125, and ISO 100 as the settings required in bright mid-day sunlight. While using this lens in the field, I seldom had the camera set below ISO 400 even when photographing still subjects. Motionless subject portraits aside, the best sports and wildlife photographs nearly always involve movement. Especially if the moving subject is relatively large in the frame, stopping that movement is going to require much faster shutter speeds such as 1/1000 to 1/2000. The light is dim early and late in the day, but those are the times that wildlife is active and sports events are often held. The fast motion and low light combination sends the necessary ISO settings high.

Often, a compromise is being made between the shutter speed and ISO settings. I often found myself sacrificing the risk of motion blur (not usually a good decision) to keep the ISO setting below 6400, and using the camera's fast frame rate can help catch a moment the subject was in less motion. While the f/11 aperture is best suited for sunny day use, compromising bright sunlight results are heatwaves, always an enemy to sharp imagery.

A long focal length creates a strong background blur, but a narrow aperture has an increased depth of field. Here is a look at a range of 600mm apertures as seen by a 600mm f/4 lens:

Canon EF 600mm f/4L IS II USM Lens Aperture Comparison Example

With the RF 600mm f/11, you get that single option. Fortunately, the 600mm focal length provides significant magnification that is able to create a nice blur. The next image illustrates the maximum background blur this lens can produce.

Canon RF 600mm F11 IS STM Lens Maximum Blur Example

A not-so-close minimum focus distance is not helpful in this regard. Obviously, all of the other sample pictures included in this review (without an extender in use) also illustrate the f/11 aperture.

Flatlining the exposure triangle. Having only f/11 available simplifies exposure calculations — only shutter speed and ISO remain available for image brightness control. Think about how this affects your favorite camera modes. Unless auto ISO is selected, Tv mode acts the same as M mode.

Canon RF 600mm F11 IS STM Lens Front Angle View

Image Stabilization

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The Canon RF 600mm F11 IS STM Lens is sized and weighted for handheld photography. Long focal lengths require fast shutter speeds to freeze the highly magnified camera shake, the narrow f/11 aperture is not helpful in this regard, and the low inertia of a light lens makes it easier to shake. Eliminating camera shake is the critical role played by image stabilization. The RF 600's image stabilization system is rated at an impressive 5-stops and 6-stops when paired with cameras featuring IBIS, such as the simultaneously introduced Canon EOS R5 and Canon EOS R6.

With the R5 behind it, the RF 600 yielded mostly sharp images at 1/50 sec., with a lower percentage of sharp images still being captured at 1/30, the longest exposure tested.

I'm jumping ahead with a look at sharpness at this point, but this image is a 100% crop captured with the EOS R6 at 1/30 sec. and processed in Canon's Digital Photo Professional (DPP) using the Standard Picture Style with a low ("2") sharpness setting.

Canon RF 600mm F11 IS STM Lens Frog Sharpness Sample Picture

The IS system is quiet, making faint whirling sounds with a hum always present, including when IS is off.

Another image stabilization benefit that should not be overlooked is the aid to AF precision. The camera's AF system can produce better focus precision if the image it sees is stabilized. Canon contends that this is true even with a subject in motion and while using action-stopping shutter speeds.

This is a 600mm lens, and, especially with the compact size and light weight, it is easy to move the lens outside of the image stabilization capabilities. The image stabilization system does not work miracles, but it is a huge aid to sharp handheld images. Whether you need to leave the tripod behind or just want the speed and freedom afforded by handholding, the RF 600mm's image stabilization is there for you.

Image Quality

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Is the Canon RF 600mm F11 IS STM Lens a sharp lens? This question was a primary one most of us wanted answered.

Before answering that question, I want to mention that this lens utilizes a gapless double-layer Diffractive Optics (DO) design. Early DO lens models were marked by low contrast and sometimes-poor bokeh, two attributes to be mindful of as we review the latest in DO technology.

Next, we should discuss the diffraction impact on the image quality produced by this lens. While a 20 MP imaging sensor is just beginning to make the softening effects of diffraction apparent at f/11, a 45 MP imaging sensor started showing impact at f/7.1. That link shows a best-case scenario for 45 MP f/11 image quality using a known sharp lens. The Canon RF 600mm F11 IS STM Lens should not be expected to exceed that result, and it does not.

Here is the image quality comparison showing the RF 600 test results against f/11 results from the same sharp lens, and here is the image quality comparison showing the RF 600 test results against f/11 results from a sharp 600mm lens. The RF 600 image quality is somewhat softer than optimal but not bad — and the contrast appears good. Even the corners are reasonably sharp. Keep in mind that our lab test results utilize low sharpening ("1" on a 0-10 scale), and bumping that setting to "2" makes a noticeable improvement. A 20 or 30 MP result is going to appear sharper.

In addition to our brutal-on-image-quality standard lab tests, I like to share some real-world examples. The images below are 100% resolution center of the frame crops from images captured in RAW format using a Canon EOS R5. The images were processed in DPP using the Standard Picture Style with sharpness set to "1" (the coneflower image had a sharpness setting of "2"), significantly lower than Canon's default setting of "4". Note that images from most cameras require some level of sharpening but too-high sharpness settings are destructive to image details and hide the deficiencies of a lens.

Canon RF 600mm F11 IS STM Lens Sharpness Comparison Example

While not razor-sharp, these results are usable, especially with a higher sharpness setting. Consider downloading the above images and increasing their sharpness in your favorite image editor.

With no aperture to change, there is no focus shift (residual spherical aberration or RSA) to be concerned about.

Samples taken from the outer extreme of the image circle can be counted on to show the worst performance a lens is capable of. Next, we'll look at a comparison showing 100% extreme corner crops captured and processed identically to the above center-of-the-frame images.

Canon RF 600mm F11 IS STM Lens Corner Sharpness Comparison Example

The corners are not tack-sharp, but they are not terrible. Corner sharpness does not always matter, and I typically don't have in-focus corners when photographing wildlife and sports. When I'm shooting landscapes, I often want images to have sharp corners, but primarily only distant landscapes support such use at 600mm. Videos captured at typical wide-aspect ratios also avoid the use of corners.

When used on a camera that utilizes a lens's entire image circle, peripheral shading can be expected at the widest aperture settings — or the only aperture setting in this case. This lens has only about 1.4-stops of peripheral shading in the corners. This number is great for wide-open aperture performance and mediocre for stopped-down performance, both of which this number represents for this lens.

APS-C format cameras using lenses projecting a full-frame-sized image circle avoid most vignetting problems. If this lens becomes compatible with a camera with an APS-C format imaging sensor, well under 1-stop of shading will be present in the corners.

One-stop of shading is the amount often used as the visibility number, though subject details provide a widely varying amount of vignetting discernibility. Vignetting is correctable during post-processing with increased noise in the brightened areas being the penalty, or it can be embraced, using the effect to draw the viewer's eye to the center of the frame. Study the pattern showing in our vignetting test tool to determine how your images will be affected.

The effect of different colors of the spectrum being magnified differently is referred to as lateral (or transverse) CA (Chromatic Aberration). Lateral CA shows as color fringing along lines of strong contrast running tangential (meridional, right angles to radii) with the mid and especially the periphery of the image circle showing the most significant amount as this is where the most significant difference in the magnification of wavelengths typically exists. "The use of gapless dual-layered diffractive optical elements helps reduce chromatic aberrations so your images are clear and detailed for high-quality results all around." [Canon]

With the right lens profile and software, lateral CA is often easily correctable (often in the camera) by radially shifting the colors to coincide. However, it is always better not to have the problem in the first place. Any color misalignment present can easily be seen in the site's image quality tool, but let's also look at a worst-case example. This is a 100% crop from the extreme top left corner of an ultra-high resolution EOS R5 frame showing diagonal black and white lines.

Canon RF 600mm F11 IS STM Lens Lateral Chromatic Aberration Example

There should only be black and white colors in these images, with the additional colors showing a minor presence of lateral CA.

A relatively common lens aberration is axial (longitudinal, bokeh) CA, which causes non-coinciding focal planes of the various wavelengths of light, or more simply, different colors of light are focused to different depths. Spherical aberration along with spherochromatism, or a change in the amount of spherical aberration with respect to color (looks quite similar to axial chromatic aberration but is hazier) are other common lens aberrations to observe. Axial CA remains at least somewhat persistent when stopping down with the color misalignment effect increasing with defocusing. The spherical aberration color halo shows little size change as the lens is defocused, and stopping down one to two stops generally removes this aberration.

In the real-world, lens defects do not exist in isolation with spherical aberration and spherochromatism generally found, at least to some degree, along with axial CA. These combine to create a less sharp, hazy-appearing image quality at the widest apertures.

In the examples below, look at the fringing colors in the out of focus specular highlights. Created by the neutrally-colored subjects, fringing color differences are introduced by the lens.

Canon RF 600mm F11 IS STM Lens Spherical and Axial Aberration Example

This result looks great.

Flare and ghosting are caused by bright light reflecting off the surfaces of lens elements, resulting in reduced contrast and sometimes-interesting artifacts. Our standard flare testing uses the sun in the corner of the frame, and most lenses show noticeable flaring at narrow apertures in this test. Because magnified sunlight becomes a heat risk, we do not use this flare test on lenses over 400mm. In use, my impression is that this lens does not have a flare problem.

With only one focal length to design for, prime lens engineers can usually create low geometric distortion, and they have done this with the RF 600. I see a slight pincushion distortion profile in our test chart. Most modern lenses have lens correction profiles available, and distortion can easily be removed using these. However, distortion correction is best avoided as it is destructive at the pixel level as some portion of the image must be stretched, or the overall dimensions reduced.

As seen earlier in the review, the amount of blur a lens can produce is easy to show, and telephoto lenses are advantaged in this regard. Assessing the quality is more challenging due in part to the infinite number of variables present in all available scenes. For the bokeh examples, I typically select a narrow aperture to show blade interaction. F/11 is the only option for this lens, and there are no blades to interact.

This is a good time to pause and reminisce of the once-popular fixed aperture mirror lenses, lenses with prize-winning donut bokeh.

Canon RF 600mm F11 IS STM Lens Defocused Highlights Bokeh Example

Though we do not need to worry about donut bokeh, any time a lens is using a Diffractive Optics, onion ring bokeh (concentric rings inside the defocused highlights) is an attribute to watch for. The above 100% crop example shows defocused highlights. While not bad, concentric circles are more noticeable than usual, and the 10-ring in the center is accentuated.

The following example shows the bokeh I more commonly saw in the field.

Canon RF 600mm F11 IS STM Lens Bokeh Example 2

That example looks lovely. So does this one:

Canon RF 600mm F11 IS STM Lens Bokeh Example 3

Except for a small number of specialty lenses, the wide aperture bokeh in the corner of the frame does not produce round defocused highlights with these effects taking on a cat's eye shape due to a form of mechanical vignetting. If you look through a tube at an angle, similar to the light reaching the corner of the frame, the shape is not round. That is the shape seen here.

Canon RF 600mm F11 IS STM Lens Cat's Eye Bokeh Example

This lens shows some modest cat's eye effect, and with the aperture not able to be stopped down, this result is what you get.

With an aperture that is always perfectly round, the RF 600 cannot produce sunstars from point light sources. Omitting the "stars" part leaves the results appearing as suns (or planets?).

Canon RF 600mm F11 IS STM Lens Sunstar Effect Example

The owner's manual warns, "For scenes where a light source is inside the screen, colored flare may occasionally appear as a halo of light around the source."

The RF 600 design includes one Super UD and six UD lens elements.

Though this lens will not optically compare to a professional model such as the Canon EF 600mm f/4L IS III USM Lens, the Canon RF 600mm F11 IS STM Lens's single aperture produces decent results, results that are reasonable for the relative size, weight, and, especially, cost of this lens.

Canon RF 600mm F11 IS STM Lens Side View


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The Canon RF 600mm F11 IS STM Lens's AF system utilizes a lead screw-type STM (stepping motor) design. This internal-focusing system provides good focusing speed, especially for short and medium distance adjustments. Focusing happens smoothly, ideal for movie recording, with a faint buzz heard during AF.

While the generous depth of field created by the f/11 aperture does not challenge AF precision, this lens has reliably focused accurately for me, a supremely-important detail.

Because of the narrow f/11 aperture, the AF area (on the review-time-current EOS R models) is reduced to 40% horizontally and 60% vertically. While the smaller area is limiting relative to wider aperture lenses used on mirrorless cameras and not welcomed, we must remember that we were once happy when a DSLR could focus an f/8 lens using only the center AF point. The "reduced" coverage equates to the AF point spread width covered by the Canon EOS 6D Mark II, and the height is significantly more than the 6D II provides. Thus, we are still far ahead of the recent past.

The RF 600 provides a focus limiter switch, permitting the autofocus range to be limited to 39.4' (12m) - ∞ or the full range. If subjects are known to be within the narrower range, that setting can decrease focus lock times.

Normal is for the scene to change size in the frame (sometimes significantly) as focus is pulled from one extent to the other, referred to as focus breathing, a change in focal length resulting from a change in focus distance. Focus breathing negatively impacts photographers intending to use focus stacking techniques, videographers pulling focus, and anyone critically framing while adjusting focus. This lens shows a moderate change in subject size as full extent focus adjustments are made, though primarily seen are subjects going into and out of focus.

The RF 600 has a focus-by-wire or electrical manual focus system (vs. a direct gear-driven design) common for STM lenses, with the manual focus ring electronically controlling the focus of the lens. FTM (Full Time Manual) focusing is supported in AF mode with the camera in One-Shot drive mode (if electronic manual focusing is enabled in the camera menu), but the shutter release must be half-pressed for the focus ring to become active. With the lens's AF/MF switch in the "MF" position, the camera meter must be on/awake for manual focusing to be available.

The non-rubberized manual focus ring is significant in size with an appropriate amount of rotational resistance, and adjustments are smooth and solidly centered with no unusual framing shift occurring.

With electronics driving AF, the rate of focus change caused by the focus ring can be electronically controlled, and it can be variable, based on the ring's rotation speed. I never acclimated to the variable feature, and with the R-series cameras, a linear (non-variable) adjustment speed can be configured. That option has been my preference, but this lens does not offer a choice. The variable MF speed is not available. The RF 600mm F11 IS STM Lens focus is adjusted slowly with 320° of ring rotation taking it from minimum focus distance to infinity, allowing precise focusing.

No focus distance scale is provided on the lens, but a digital scale can be enabled in the electronic viewfinder or on the rear LCD.

With a minimum focus distance of 14.8' (4.5m), this lens creates a 0.14x maximum magnification spec. While that is a rather low number, it is not far behind Canon's current 600mm f/4 lens's 0.15x figure.

ModelMin Focus Distance "(mm)Max Magnification
Canon RF 100-400mm F5.6-8 IS USM Lens34.6(880)0.41x
Canon RF 100-500mm F4.5-7.1 L IS USM Lens35.4(900)0.33x
Canon RF 200-800mm F6.3-9 IS USM Lens31.5(800)0.25x
Canon RF 600mm F4 L IS USM Lens165.4(4200)0.17x
Canon RF 600mm F11 IS STM Lens177.2(4500)0.14x
Canon RF 800mm F5.6 L IS USM Lens102.4(2600)0.34x
Canon RF 800mm F11 IS STM Lens236.2(6000)0.14x
Sony FE 200-600mm f/5.6-6.3 G OSS Lens94.5(2400)0.20x
Sigma 60-600mm f/4.5-6.3 DG OS HSM Sports Lens23.6(600)0.30x
Sigma 150-600mm f/5-6.3 DG OS HSM Sports Lens102.4(2600)0.20x
Sigma 150-600mm f/5-6.3 DG OS HSM C Lens110.2(2800)0.20x
Tamron 150-600mm f/5-6.3 Di VC USD G2 Lens86.6(2200)0.26x

A subject measuring approximately 7.8 x 5.2" (198 x 132mm) fills the frame of a full-frame camera at the minimum focus distance. The frog photo below illustrates this lens's maximum magnification capability

Canon RF 600mm F11 IS STM Lens Maximum Magnification Example

Need a shorter minimum focus distance and higher magnification? An extension tube mounted behind this lens should provide a slight decrease and increase, respectively. Extension tubes are hollow lens barrels that shift a mounted lens farther from the camera, allowing shorter focusing distances at the expense of long-distance focusing. Electronic connections in extension tubes permit the lens and camera to communicate and otherwise function as normal. As of review time, Canon does not have RF mount-compatible extension tubes available, but third-party options are available.

Canon RF 600mm F11 IS STM Lens with Extender

Compatible with (and simultaneously introduced with) the RF 600 are the Canon RF 1.4x Extender and Canon RF 2x Extender. Retaining the lens's native focus distance range, these options offer far greater magnification impact than extension tubes. That these extenders cost a significant percentage of the base lens cost makes them harder to justify, but Canon alternatives to the resulting focal lengths still cost considerably more.

This black-crowned night heron proved the only living subject patient enough for me to make all of the lens changes necessary for a focal length comparison using this lens and also the RF 800. The thin crescent moon moved through the frame more rapidly (and the sky also darkened rapidly). Results from the RF 800 are included to help illustrate the available focal lengths.

Canon RF 600mm F11 IS STM Lens Focal Length Comparison with Extenders

The addition of a 1.4x Extender to the RF 600 creates an attractive 840mm IS lens. Extend the focal length without increasing the aperture opening, and the effective aperture is reduced — by 1-stop with the 1.4x mounted. Few are going to find f/16 attractive for most 840mm uses with diffraction impact showing even on lower-resolution R-series cameras. Magnifying the image and adding optics to the path are not helpful from an image quality perspective, but using only the center of the native image circle is advantageous. That said, in bright light, the 840mm results from this lens can be usable. Here is the comparison.

The RF 1.4x adds a small amount of barrel distortion to the image but has little effect on lateral CA.

The addition of a 2x Extender creates an impressive-sounding 1200mm focal length lens. In this case, the aperture is reduced 2-stops to a dauntingly-narrow f/22. Autofocusing that combination is a superpower of some R-series cameras, including the Canon EOS R5 and Canon EOS R6. Adding the 2x extender to the optical formula significantly degrades image quality — here is the comparison. The RF 2x adds a small amount of barrel distortion to the image and magnifies (blurs?) the lateral CA. While this combination works, I recommend getting closer without the 2x mounted.

Build Quality & Features

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Various things we use regularly fold or retract to save space when not in use, but when was the last time you saw a prime (fixed focal length) lens retract aside for focusing? Some recently introduced standard zoom lens models retract to a shorter parked length, but not telephoto lenses. There is a lot of empty space in a long telephoto lens, so why not design it to retract? The RF 600 and RF 800 take advantage of this design concept, enabling a substantial transport and storage size reduction.

From the locked retracted position, rotate the substantially-sized locking collar counter-clockwise a short amount. Without loosening the hold, push the collar forward 2.75" (69.9mm) until the lens is fully extended, and then rotate the collar clockwise with the lens now ready to use. The collar provides a light click with haptic feedback to assure locked and unlocked positions. While the lens locks with only a slight rotation of the collar, the camera will not use the lens unless it is in the fully-click-locked position, complaining "Set the lens to the shooting position" otherwise.

Canon RF 600mm F11 IS STM Lens Angle View

The RF 600mm lens exterior construction is polycarbonate engineering plastic with a nice matte black finish. The end of the lens barrel has a leather-like texture and feel.

Fully extended, this lens exhibits no discernable play in the barrel.

Canon's RF lenses feature a knurled "Control Ring" that is able to be configured for fast access to settings, including aperture, ISO, and exposure compensation. The far forward position of this ring makes it a stretch to reach when handholding balanced on the left hand. As usual, the control ring is clicked by default, and this ring's clicks will be audible in camera-based audio recordings. Canon offers a control ring click stop removal service (at a cost).

Obviously, black was the chosen color for this lens (vs. white for Canon's large L-series telephoto lenses). This lens gets hot in direct sunlight on a hot day.

Canon RF 600mm F11 IS STM Lens Switches

This lens's three switches have a shallow profile. A slightly raised area around the image stabilizer switch aids in tactiley differentiating this one from the two AF-related switches. Just enough raised area is provided in the center of each switch to make them easily usable, even with gloves on.

Canon RF 600mm F11 IS STM Lens Mount

This lens is not weather sealed. If it is raining, the amount of light available will send your ISO setting into ugly range anyway. If you are at the beach or on the boat, use caution or a rain cover.

"One DO lens has the optical characteristics of multiple lenses." [Canon] We already talked about narrower lens elements contributing to lighter weight, but fewer lens elements also mean lighter weight, and light weight is a key feature of this lens. For a 600mm lens, this one is a dream to carry and easy to handhold.

ModelWeight oz(g)Dimensions w/o Hood "(mm)FilterYear 
Canon RF 100-400mm F5.6-8 IS USM Lens22.4(635)3.1 x 6.5(79.5 x 164.7)672021
Canon RF 100-500mm F4.5-7.1 L IS USM48.2(1365)3.7 x 8.2(93.8 x 207.6)772020
Canon RF 200-800mm F6.3-9 IS USM Lens72.4(2050)4.0 x 12.4(102.3 x 314.1)952023
Canon RF 600mm F4 L IS USM Lens109.1(3090)6.6 x 18.6(168.0 x 472.0)DI 522021
Canon RF 600mm F11 IS STM Lens32.8(930)3.7 x 10.6(93.0 x 269.5)822020
Canon RF 800mm F11 IS STM Lens44.5(1260)4.0 x 14.2(101.6 x 361.8)952020
Sigma 60-600mm f/4.5-6.3 DG OS HSM Sports95.3(2700)4.7 x 10.6(120.4 x 268.9)1052018
Sigma 150-600mm f/5-6.3 DG OS HSM Sports101.0(2860)4.8 x 11.4(121.9 x 289.6)1052014
Sigma 150-600mm f/5-6.3 DG OS HSM C68.1(1930)4.1 x 10.2(105.0 x 260.1)952015
Sony FE 200-600mm f/5.6-6.3 G OSS Lens74.8(2120)4.5 x 12.5(115.5 x 318.0)952019
Tamron 150-600mm f/5-6.3 Di VC USD G271.0(2010)4.3 x 10.2(108.4 x 260.2)952016

For many more comparisons, review the complete Canon RF 600mm F11 IS STM Lens Specifications using the site's lens specifications tool.

Here is a visual comparison:

Canon RF 600mm F11 IS STM Lens Compared to Similar Lenses

Positioned above from left to right are the following lenses:

Canon EF 100-400mm f/4.5-5.6L IS II USM Lens
Canon RF 600mm F11 IS STM Lens (extended, then retracted)
Canon RF 800mm F11 IS STM Lens (retracted, then extended)

Use the site's big lens product image comparison tool to visually compare the Canon RF 600mm F11 IS STM Lens to other lenses. That link is preloaded with an interesting comparison.

The RF 600 uses the relatively large but common 82mm standard filters.

Canon RF 600mm F11 IS STM Lens Bottom View

This lens is easily handholdable, but sometimes a tripod is desired to steady the camera while composing and capturing an image. Tripod rings provide balanced tripod mounting, avoiding tripod head and camera strain and sag while allowing easy camera rotation. This lens does not have a tripod ring. However, it has a small fixed foot with a threaded socket available for tripod mounting. I attached a small Wimberley Lens Plate (P20 or P30) to this foot. This combination remained low profile, but finger clearance over the plate was not accommodated.

Photographing in vertical orientation requires using a tripod head's drop notch, and using the drop notch can provide gimbal-like behavior if properly balanced. Most gimbal heads do not provide that versatility — select a gimbal head type for the orientation desired. Perhaps someone will introduce an L-bracket for this lens.

While the RF 600 can easily be mounted on a tripod, challenge remains. Common is for telephoto lenses to extend forward with some slight play in the extending part of the lens. The tripod mount being located behind the extension means that play is not noticed in the camera. In this case, the extension is behind the tripod mount. The lens does not have noticeable play when extended, but the pressure of moving the camera around is quite noticeable with the narrow 600mm angle of view. The camera and lens flex enough to challenge critical subject framing, with most of the flex originating at the tripod foot.

Vibrations also challenge tripod use of this lens. The vibrations are not easy to control without IS enabled, and with IS enabled, the scene drifts a significant amount as the system attempts to offset lens movement. Consider using the 10-second self-timer or a remote release to go completely hands-off.

The wind creates another issue, especially with the large lens hood attached. A light wind can set up continuous vibrations, and IS may be required to tame such. Canon's image stabilization systems usually self-adjust to tripod use, though the owner's manual indicates that the RF 600 system might not be fully effective on a tripod. Smaller, lighter camera and lens combinations do not require the tripod strength and rigidity that heavier setups require, but this lens and narrow angle of view will appreciate a rigid tripod.

The Canon Lens Cap E-82II is included in the box, but the Canon ET-88B Lens Hood is optional.

Canon ET-88B Lens Hood

While this plastic hood could not cost much to produce, Canon continues to omit lens hoods from most non-L lens boxes and continues to charge a substantial amount for them. This is a molded plastic hood with an interior ribbed to avoid reflections and a push-button release to make installation and removal easy. The ET-88B is large, providing significant dust, moisture, and light protection to the front lens element.

Canon RF 600mm F11 IS STM Lens Angle View with Hood

Sorry for the lack of with-hood comparison photos in this review. Canon did not provide the ET-88B hood, and this hood was out of stock at retailers during my time with this lens.

Canon LZ1328 Lens Case

A lens case is not included with the RF 600 f/11. Canon's suggested option is the LZ1328 Lens Case. Though not inexpensive, this is a nice case.

Canon RF 600mm and 800mm F11 IS STM Lens

The RF 600 and RF 800, each with a camera mounted, along with both RF extenders, fit comfortably together in the relatively small MindShift Gear BackLight 26L, the backpack I typically carry my landscape photography kit in.

Canon RF 600mm F11 IS STM Lens Cap

Price, Value, Compatibility

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"Diffractive Optics technology helps to reduce the necessary number of lenses and greatly diminish the cost of the lenses, making them affordable for a broader group of photographers." [Canon] While this lens is not a high-end professional lens, it is hard to argue that the RF 600 is not a good value.

As an "RF" lens, the Canon RF 600mm F11 IS STM Lens is compatible with all Canon EOS R series cameras. Canon USA provides a 1-year limited warranty.

The reviewed Canon RF 600mm F11 IS STM Lens was on loan from Canon USA.


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The Canon RF 200-800mm F6.3-9 IS USM Lens is a good alternative to the RF 600 F11.

Canon RF 200-800mm F6.3-9 IS USM Lens Compared to RF 800mm F11 IS STM Lens

In the image quality comparison, we see the two lenses producing similar sharpness. The prime lens has modestly stronger peripheral shading when compared at f/11.

The Canon RF 200-800mm F6.3-9 IS USM vs. RF 600mm F11 IS STM Lens comparison shows the zoom lens weighing more than twice as much and measuring a couple of inches longer at 600mm (both lenses retract). The zoom lens has 9 aperture blades vs. 0 — while the prime lens's aperture is always a perfectly round f/11. The zoom lens uses 95mm filters vs. 82mm.

The zoom lens has a Nano USM AF system vs. STM, a 5.5 stop IS rating vs. 5, and a 0.25x maximum magnification vs. 0.14x. The zoom lens has a 1 stop wider aperture at 600mm and offers dramatically increased versatility with its focal length range, but it costs more than twice as much as the prime lens.

Use the site's comparison tools to create additional comparisons.

Canon RF 600mm F11 IS STM Lens Moonset Sample Picture


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Circling back to my first question in the Canon RF 600mm F11 IS STM Lens review, "Who is going to want this lens?" While the f/11 max aperture alone will send professional and serious amateur photographers off to other choices for their primary big lens, those wanting a significantly long focal length lens that is extremely compact, ultra-light, and impressively affordable have found the right choice in the RF 600. At about 5% of the price of the EF 600mm f/4L IS III, the Canon RF 600mm F11 IS STM Lens, especially when used in bright light, creates nice imagery.

Fun is a great reason to go photographing, and being a low burden to carry around greatly aids in the fun of using this lens. Carry it on your exercise walks in the park or take it kayaking with you on the lake, enabling you to take advantage of unexpected opportunities.

Do you have kids or grandkids? Photography is a great opportunity to spend time together, and this is a great starter lens for wildlife and sports photographers.

Even professional and serious amateur photographers may find the RF 600 getting some casual use if it is available. The image quality produced by this lens far exceeds what is required for social media imagery.

After delivering a wide range of expensive, incredible-performing RF lenses, Canon has been delivering some affordable, compact models. The Canon RF 600mm F11 IS STM Lens fits solidly into the latter category. This lens opens new opportunities for those with limited budgets.

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Canon RF 600mm F11 IS STM Lens
Canon RF 600mm F11 IS STM Lens
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