If you’re like me you like to know what’s going on inside your camera or lens to some degree. They are tools, and if I want to get the best use out of my tool I need to know it’s strengths and weaknesses.See the entire article on the LensRentals Blog.
You may not have noticed, especially if you shoot just Canon or Nikon, but there’s been a quiet change in autofocus motors going on. Or you might have barely noticed marketing-fluff terms like ‘linear focusing’ or ‘electromagnetic focusing’ without really understanding what they meant. Even if you understood the general terms, you probably aren’t really certain how they work, or how they might be better or worse than what we’ve been using.
So I thought some of you might like taking a look into what might (or might not) be a big deal: the changes that are being made in autofocus motors. Today I’m going to discuss linear electromagnetic focusing motors. I may do another post about linear-piezo and ring-to-linear piezo motors later, but those are, so far, less common than the electromagnetic motors.
"After we published a number of posts about copy-to-copy variation, people were quick to say that this company or that needs to 'just' improve quality control. I totally agree but realize most people don’t have a clue what ‘improving quality control’ would really look like. I think they have some vague idea of hiring a guy named Joe to sit at the end of the assembly line, check all the lenses, and reject all the bad ones. Optical quality control for lenses is way, way more complicated than that."Check out the LensRentals Blog for more info.
We’re excited to announce that Roger Cicala and Aaron Closz will be participating in an Ask Me Anything (AMA) session of reddit’s /r/photography forum on Monday at 3 pm ET. Over the last few years, /r/photography has been a huge supporter of our blog, so we wanted to give back by inviting the users of reddit to Ask Us Anything. This gives our readers a unique opportunity to ask Roger and Aaron on anything relating to cameras, lenses, other photography and video related gear and about all the techy articles they often post here on our blog. They’re also able to provide their extensive knowledge, and with one of the largest inventories of photography gear in the world, we have a lot to talk about! Be sure to tune in, and submit your questions on Monday at 3 pm ET!
"For the most part, there weren't many surprises in this teardown. We've seen how Sigma has remade themselves as a company making only superb optics at very reasonable prices in the last few years. This lens is constructed very well. There isn't the amazing heavy-duty construction of the Canon 35mm f/1.4. Instead, I'd characterize the construction of the Sigma as very efficient and carefully laid out. There's a solid metal core with other parts all connecting directly to that core. Little touches like pegs to make sure a part is inserted in the proper rotation and shields over critical parts didn't add much expense or weight, but show care was taken in the design. There's nothing in this teardown that looked like a weak point."You can find links to the other 35mm lens teardowns at the beginning of the this teardown.
"I'm sure you can tell we're impressed with the Canon 35mm f/1.4 Mk II. The weather resistance appears better than most weather resistant lenses. (As always, I'll add that weather resistance still means water damage voids the warranty.) The mechanical construction is beyond impressive. This lens is massively over-engineered compared to any other prime we've ever disassembled. It's built like a tank where it counts; on the inside. Moving parts are huge and robust. Six big screws are used in locations where 3 smalls screws are common in other lenses. Heavy roller bearings move the focusing group, it doesn't slide on little nylon collars.Check out the entire post for the full teardown details.
It's also designed thoughtfully and logically. Things that will inevitably get damaged on any lens, like the front element and filter ring, are designed to be replaced easily. There are some things inside, particularly with the tensioning screws and springs, that I'm not certain I understand the purpose of, but I am certain there is a purpose. If I had to summarize the mechanical design of this lens, I would say simply that no expense was spared, no corner was cut.
Sometimes things are expensive because they're worth it. Sometimes they're heavy because they're so solidly constructed. This is one of those times."
"When Lensrentals.com first got the first Canon 5Ds and 5D sr cameras in stock, Aaron and I immediately started screaming that we wanted to take one apart. It turns out we received enough 5Ds cameras to let us have a day with one to do just that. Of course, we don't expect to find out anything amazing and revealing. We expect it will look pretty much like the Canon 5DIII and 7DII on the inside. But hey, you never know. Plus we'll be repairing these soon enough, so we might as well find our way around now.See the entire article on the LensRentals Blog.
If you want to do some comparisons yourself, you can compare this to our Canon 5D III teardownand Canon 7D II teardown. Or if you'd rather follow along from home with your own 5Ds go grab your screwdrivers and let's get started!"
"Like everybody else, we're pretty excited to get our hands on Canon's new 5DS and 5DS R. There are already a lot of hands-on articles about the cameras that probably have told you more than you need to know to make your purchase decision. Of course, for most of the Canon shooters who read this blog, the purchase decision was just which place you want to buy it from.Resolution tests included use of the Canon 300 f/2.8L IS II USM, Zeiss 85mm f/1.4 Otus, Zeiss 21mm f/2.8 Distagon T* ZE & the Canon 50mm f/1.4 USM. To find out how each lens performed when paired with the 5D III, 5Ds and 5Ds R, check out the full LensRentals Blog article.
For me, I want some lab data to see just how much of a difference those megapixels make. More particularly, I want to see how much of a difference they make when shot through a reasonably good lens, an excellent lens, and an adequate lens. Some people want to simplify things too much and claim certain lenses are 'good enough' for the new cameras and others aren't. It's not that simple.
So we begged and threw temper tantrums until Drew agreed to let us have a couple of the new cameras for a couple of days testing in our Imatest lab. That was enough time for us to get a quick overview using several different sample lenses, but it will be months before we have a good database of which lenses are most capable on the new cameras."
"I've been blogging about testing and taking apart camera equipment for almost a decade. Lensrentals.com has many thousand lenses these days, and they all get used frequently. When you have lots of lenses and they get used frequently, stuff gets inside them.Check out the amazing, illustrated article on the LensRentals Blog.
Usually the stuff that gets inside is dust. Our repair techs open up and clean dust out of more than 100 lenses a week. Not because the dust matters a bit in a photograph; it doesn't. But because people still seem to think it does. People also, for reasons I can't understand, seem to think that weather sealed lenses are less likely to get dust in them than non-weather sealed lenses. I'm not sure why they think this, but they do.
Sometimes the stuff that gets inside them is interesting and we get to blog about it. We found a spider, complete with web, inside a lens once and yesterday we got to add a new item to our 'found inside lenses' collection; a nice, fat, fly. And not just a fly inside a lens, but one way down deep inside a weather sealed lens. So deep that it took 4 hours of work to get it out."
"Every once in a while we notice something, because of the large quantities of cameras and lenses we buy, that we think people should be aware of. This particular issue won't affect our renters; we've sent the affected cameras back. It may not affect very many people at all, since this is from a relatively small sample size. But I still think it worth mentioning.See the entire article on the LensRentals Blog.
The bottom line is that 4 of the Canon T6s and 2 of the T6i cameras we received had to be sent back because of a defect in the sensor stack (the layers of filter glass over the sensor). This is out about 10 copies of each; the others were absolutely perfect."
"Most of you know I've been very impressed with Sigma's new Art lenses. Their 35mm f/1.4 Art I still think is the sharpest 35mm prime lens made. The 50mm f/1.4 Art is also superb.See the entire article on the LensRentals Blog.
When I heard about the Sigma 24mm f/1.4 Art lens, I had some mixed emotions. I was excited that we might get a 24mm lens of similar quality to their 35mm. But the logical side of me thought that perhaps Sigma had bitten off a bit more than they could chew this time. Designing a wide-aperture 24mm lens is much more difficult than designing a fast 35mm lens. Even the best 24mm f/1.4 lenses (I consider the Canon 24mm f/1.4 L to be the best current offering, although that's arguable) still have distortion, aberrations, and some edge softness.
But when our first five copies of the Sigma 24mm f/1.4 arrived, I swiped them from intake and took them over to the testing lab for a quick look and MTF testing on our optical bench. We already had results from the Canon 24mm f/1.4 L, the Nikon 24mm f/1.4 ED AF-S, and the Rokinon 24mm f/1.4 lenses in our database to compare them to."
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