RF 28-70 f/2 Breathing Test and Discussion - Lens Breathing E2
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- Опубліковано 10 лип 2024
- This is part of my series looking a breathing, or the lens aberration where the focal length changes with the focusing position. This time we’re looking at Canon’s monster RF 28-70mm f/2L USM.
This is a big lens, with a very fast aperture, and quite a lot of focal shift. The bets focal lengths are the wider ones, 28 and 35 both do okay. However, the focal shift is quite significant at the longer focal lengths of 50 and 70mm. While this is a fantastic lens for portraiture and still photography, it can be a bit more challenging to to use with video due to this aberration.
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Chapters
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00:00 Intro
01:15 What is breathing?
01:50 Test Protocol
03:03 Test Results
05:47 Discussion
Excellent video!!
funny, I've been following you since I bought my Canon R5C last year and I'm sitting right now thinking about whether I should buy this lens - both for filming and taking pictures with it... It's just before I think I might as well run with an EF version instead and then wait until I can afford their canon rf 24-105 f2.8. It should be more suitable for use with film or their new RF 35mm f/1.4 VCM. Both of these show a new direction in relation to something that works with a hybrid approach between film and photo. Thanks for sharing - love your dry and to the point approach in your presentations and review.
Just to be clear, there is no EF version of this lens. This video is on the RF 28-70mm f/2L USM, not the 24-70mm f/2.8L IS USM. The f/2.8 version will be coming next week, and it performs a lot better than the 28-70 does (spoiler, breathing is functionally not an issue).
The RF 24-105mm f/2.8L IS USM from the tests I've seen breathes a lot, not quite on par with this 28-70, but much more than the 24-70/2.8. However, I haven't seen a test that graphs it out like I have, so I don't know if it's a problem that only shows up when focusing from MFD to infinity or if it's still fairly strong at normal working distances. I'd like to test a 24-105/2.8, because nobody else is testing the lenses in this fashion, but I couldn't get my hands on one when they were first released, and haven't really had the urge to get one since then.
I'm also half tempted to get a 35/1.4L. I try to shoot these videos at about 35mm, and that would be a very nice lens for that purpose. Plus I can see some other uses for it like night landscapes and astrophotography.
I would say this is a problem for stills. Because this lens is often compared to primes, and it may seem to some that formally it is not so different from 85mm - but in truth it is very different. Primes breathe forward, but this lens breathes backward and very strongly. In fact, at 70mm it may be closer to 50mm prime lens at close-up portrait distances than to 85mm prime lens.
Of course, this is much more bigger problem with telephoto lenses. Because with telephoto lenses - focal length is not a matter of artistic decision - we are actually paying to reach farther when we buy a telephoto lens.
I have long had the idea of testing some of the severe cases among the 70-200 class, for example, one of the stabilized Tamrons or the second version of Nikon. And compare it with some prime that breathes forward. I'm wondering if a 200mm Tamron can "meet" a 100 2.8 macro at some distance? That would be hilarious. I don't have the opportunity to do something like that soon, so I don't mind if you do exactly that experiment.
So the reason I said that breathing isn't a problem for stills is because you don't have the time component as you have in video, and the change in angle of view doesn't become a distraction. For the most people, the vast majority of still photographers I've meat have no idea that their 70mm lens isn't 70mm at any given focus distance.
Also, while you're talking about primes, it's not a primes versus zooms thing. It's a design of the focusing system thing; specifically internal/rear versus overall linear extending. Different designs will behave differently, even within the same overall class of focusing system.
Notice the 28-70/2L's AoV widens as you focus closer, but the 24-70/2.8L's doesn't, it get's narrower (though only slightly). Moreover, while the video isn't live yet (it's coming I think next week), the RF 15-35/2.8L IS USM does both depending on the zoom position.
As for the telephoto question... I'd like to look into it, but I only have access to a limited amount of glass. I'd love to test more, but that means getting it, and I'm no where near big enough in the photography "influencer" space that anybody would be willing to send me random lenses to test. So I can test what I can, but that's not the most exhaustive list.
That said, I am working on cleaning up the code I used for this and making it available to anyone who wants to run it. So that might get some more data points for stuff I can't actually test myself.
Hi ! Really useful data but i'm having a hard time reading your charts. Can you indicate the distance with linear units? Like 1, 1.5, 2, 3, 5, 7 meters? I can only see 10**1 feet and meters, but what is 10**0 ?
I'll take that into consideration for the future
For reference, 10**0 feet/meters is 1 foot/meter, 10**1 is 10 feet/meters, 10**2 is 100 feet/meters.
That’s some robust breathing. Almost unusable at 70mm for important footage. Nice lens still.
Pathetic that Canon only offers breathing correction on consumer bodies. Also are the coatings still peeling off those lenses?
First time I'm hearing about the peeling, are you serious 😲?
@MrWiseinheart, I've had my 28-70/2 in use for over a year, and there's no indication fo coatings failing or peeling off on my lens.
This is also the first time I've heard of a problem as well. While I wouldn't be surprised that there were isolated failures, or failures with abused lenses that people claim weren't abused. However, if there was a wide spread problem, even if it was only limited to a small serial number range, I would have expected a service advisory or partial recall on the lens which certainly hasn't happened.
@@PointsInFocus ok thanks for that, good to know 👍. I have the lens as well so was kind of worried.