The Canon EF 600mm f/4.0 L IS USM Lens is Canon's longest, almost heaviest
(the Canon EF 400mm f/2.8 L IS USM Lens
is 10g heavier) and almost most expensive
(the Canon EF 800mm f/5.6 L IS USM Lens costs more) EF lens.
It has the reach needed for - and is commonly used for - bird photography,
small and distant animal photography, surf photography (from shore), long distance sports photography and many other similar pursuits.
If you can get past its size, weight and price, the Canon EF 600mm f/4.0 L IS USM Lens, does not leave much to be disappointed in.

The size of the Canon EF 600mm f/4.0 L IS USM Lens is apparent in the above comparison photo with the large
Canon EF 500mm f/4 L IS USM Lens
(above left).
Most photographers regard the 500 f/4 as a large lens - but, size is relative.
The Canon EF 600mm f/4.0 L IS USM Lens weighs in at 11.8 lbs.
The 600 is 6.6" (168mm) in diameter and 18" (456mm) in length (without the lens hood attached).
For comparison, the
Canon EF 500mm f/4 L IS USM Lens weighs 8.5 lbs (3.3 lbs less than the 600) and measures 5.8" x 15.2".
Canon has made an effort to keep the Canon EF 600mm f/4.0 L IS USM Lens as light as possible without sacrificing strength by utilizing a Magnesium alloy lens barrel.
The carbon fiber lens hood is very light (and very expensive to replace).
You will want to use it for protection and improved contrast.
I should note that Canon uses a protective front lens element in the 600 IS.
As with all Canon Super Telephoto L Lenses, build quality of the Canon EF 600mm f/4.0 L IS USM Lens is excellent.
The focus ring and the many switches resident on the lens all work smoothly.
It will be obvious to any photographer that this is a very high quality piece of equipment - professional grade.
Although it is for the long focal length that many people buy the Canon EF 600mm f/4.0 L IS USM Lens, its image quality is excellent as well.
The 600 IS has very decent sharpness wide open (including wide open full frame corners) and improves some until stopped down 1 f-stop or so.
The Canon EF 500mm f/4 L IS USM Lens is very slightly sharper until f/5.6,
but not enough so for sharpness to be a big differentiator.
A very small amount of vignetting is apparent at f/4 in full-frame body image corners (slightly less than from the 500 f/4 IS).
CA (Chromatic Aberration) is very well controlled.
Distortion is also negligible.
Like the rest of the Canon Super Telephoto lenses, the Canon EF 600mm f/4.0 L IS USM Lens is compatible with the Canon EF Extenders.
Image quality with the Canon EF 1.4x Extender mounted is reasonable -
especially for an 800mm f/5.6 IS lens.
As always, this extender adds CA (Chromatic Aberration), adds barrel distortion, reduces contrast/sharpness and slows autofocus.
Adding a Canon 2x Extender
will result in a 1200mm f/8 IS lens that will autofocus only on Canon EOS 1-Series bodies and then only with the center focus point.
Image results will show a noticeable amount of sharpness and contrast loss.
There is noticeably more barrel distortion when using the 1.4x with the 600mm on a Full Frame body
than with the Canon EF 500mm f/4 L IS USM Lens on the same body.
The bare 500 has some pincushion distortion that counters the 1.4x's barrel distortion.
Eliminating background distractions is generally desired when photographing birds and similar subjects.
Combining a relatively wide 8-blade aperture with 600mm telescopic compression can turn a background into a beautiful, smooth blur.
Image Stabilization (IS) is an excellent feature present on the Canon EF 600mm f/4.0 L IS USM Lens.
It will not stop subject motion, but makes a big difference in camera/lens motion.
Both Mode 1 and 2 IS are available.
Mode 1 IS attempts to stop camera/lens motion in all directions.
Mode 2 IS allows panning with a moving subject.
As with all IS-equipped lenses, an on/off switch allows IS to be disabled.
Even with the 600 L IS mounted on a tripod, IS helps stop vibrations as the IS version on this lens is tripod-sensing.
The Canon EF 600mm f/4.0 L IS USM Lens knows that a tripod is being used when vibrations go below a certain level.
Keep IS turned on when mounting the Canon EF 600mm f/4.0 L IS USM Lens on a tripod to take advantage of this secondary IS mode - reducing mirror slap, shutter and tripod vibrations.
Utilizing Ring USM (Ultrasonic Motor), the Canon EF 600mm f/4.0 L IS USM Lens autofocuses very fast and has FTM (Full Time manual focus).
AF accuracy is excellent in both one-shot and AI Servo modes.
A 3-position focus limiter switch allows focusing distances to be limited to a specific distance range - or to be unlimited.
Limiting the focus distance range can improve focus lock times and reduce focus hunting.
Autofocus Stop buttons near the objective lens allow autofocus to be temporarily stopped.
This feature is handy when tracking action in AI Servo mode and one-shot-style focus is needed for a specific situation -
perhaps a focus-and-recompose portrait of a motionless person, bird, landscape or other subject.
The Canon EF 600mm f/4.0 L IS USM Lens' Focus Preset feature allows a specific focus distance to be programmed into the lens.
Pressing the Focus Preset button quickly sets focus to the pre-programmed distance.
You might want to use this feature if you have a perch set up for birds to land on.
When the bird lands, press the button and shoot.
The Tufted Titmouse picture above was taken with the Canon EF 600mm f/4.0 L IS USM Lens mounted on a
Canon Extender EF 1.4x
which was mounted on a
Full Frame
Canon EOS 1Ds Mark II Digital SLR.
This uncropped sample picture was taken at near-minimum focus distance for the Canon EF 600mm f/4.0 L IS USM Lens (18'/5.5m).
Photographers using a 1.3x FOVCF Digital SLR
should be able to get similar minimum focus distance framing without the 1.4x extender.
Photographers using a 1.6x FOVCF Digital SLR
should be able to get even tighter framing without the 1.4x extender.
The Canon EF 500mm f/4 L IS USM Lens
can produce identical framing to the sample shot above as it shares the same .12x maximum magnification spec.
But, the 500 needs to be 3.2' (1m) closer to the subject (14.8'/4.5m) to achieve this framing.
Of course, an can be used to allow closer focusing (higher image magnification, tighter subject framing).
I frequently use the Canon 25mm Extension Tube with this lens to allow
tighter framing of small birds - some additional vignetting can be expected if using a full frame body with this combination.

The above photo shows the
Canon EF 500mm f/4 L IS USM Lens
(left) and the Canon EF 600mm f/4.0 L IS USM Lens with their lens hoods in place.
The 500 IS is shown with a Wimberley P40 Lens Plate
attached, the 600 IS is shown with a Wimberley P50 Lens Plate attached.
Also noticeable in the above photo is the padded top side of the tripod foot on these lenses.
The Canon EF 600mm f/4.0 L IS USM Lens is frequently carried upside down with the tripod foot acting as a handle.
The pad provides a better grip in addition to being more gentle on your fingers.
This tripod ring (or collar) has positive stops at each 90 degree setting as it rotates.
It is not removable on this lens (nor the 500).
Most people find the Canon EF 600mm f/4.0 L IS USM Lens too heavy to shoot handheld with for any length of time.
And if you are super strong, you will want to use the tripod ring to rest on your hand with your elbow on your hip for support.
So, there is little reason to remove it.
The foot itself is removable with a hex key wrench.
The primary reason to remove it is for replacement with a specially designed lens plate foot such as one made by Wimberley.
Dragging your mouse down over the labels will show you the respective lens in the lower image.
| Model | Dimensions w/o Hood | Weight | MFD | MM | |||
| Canon EF 200mm f/2 L IS USM Lens | 5.0 x 8.2" | (128 x 208mm) | 5.6 lbs. | (2,520g) | 6.2' | (1.9m) | .12x |
| Canon EF 300mm f/2.8 L IS USM Lens | 5.0 x 9.9" | (128 x 252mm) | 5.6 lbs. | (2,550g) | 8.2' | (2.5m) | .13x |
| Canon EF 400mm f/2.8 L IS USM Lens | 6.4 x 13.7" | (163 x 349mm) | 11.8 lbs. | (5,370g) | 9.8' | (3.0m) | .15x |
| Canon EF 400mm f/4 DO IS USM Lens | 5.0 x 9.2" | (128 x 233mm) | 4.3 lbs. | (1,940g) | 11.5' | (3.5m) | .12x |
| Canon EF 500mm f/4 L IS USM Lens | 5.8 x 15.2" | (146 x 387mm) | 8.5 lbs. | (3,870g) | 14.8' | (4.5m) | .12x |
| Canon EF 600mm f/4 L IS USM Lens | 6.6 x 18.0" | (168 x 456mm) | 11.8 lbs. | (5,360g) | 18.0' | (5.5m) | .12x |
| Canon EF 800mm f/5.6 L IS USM Lens | 6.4 x 18.1" | (162 x 461mm) | 9.9 lbs. | (4,500g) | 19.7' | (6.0m) | .14x |
Canon EF 600mm f/4.0 L IS USM Lens Sample Pictures
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Canon EF 600mm f/4.0 L IS USM Lens at Adorama (Imported)
Canon EF 600mm f/4.0 L IS USM Lens at Adorama
Canon EF 600mm f/4.0 L IS USM Lens at Amazon.com
Canon EF 600mm f/4.0 L IS USM Lens at J&R
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Robert Royse