RF 24-70mm f/2.8L IS USM Breathing Test and Discussion - Lens Breathing E3

This video is part of my series looking at breathing, or the lens aberration where the focal length changes with the focusing position. This time we’re looking at every professional photographer’s workhorse lens, the RF 24-70mm f/2.8L IS USM.
While Canon doesn’t market the RF 24-70mm f/2.8L IS USM as being designed for minimal or no breathing, in testing it actually performs really well. It also exhibits an interesting artifact in how the lens’s focal length change with zoom position; wider focal lengths get wider as you focus closer to the camera while the longer focal lengths get longer doing the same.
Either way, breathing is quite well controlled and in my experience barely noticeable in normal use when shooting video.
RF 28-70mm f/2L USM tests video : • RF 28-70 f/2 Breathing...
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Chapters
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00:00 Intro
00:31 What is breathing?
01:26 Test Protocol
02:37 Test Results
04:10 Discussion

[@Twobarpsi]

Excellent information!!

[@PiingpeiPictures]

you deserve more views

[@dima1353]

Hello. I like your approach.
Do you think it is reasonable to assume that all traditional prime lenses, in which no measures have been taken to correct breathing, will behave the same?
For example 50 mm lenses. Like EF 50 1.4, ef 50 1.8, old minolta 50 1.7, takumar, yashica.... I mean they all are just some sort of "7/6" which move forward and backward, what difference could there be ?

[@PointsInFocus]

As far as my understanding of optics go, that assumption is valid.
All lenses that extend when breathing will do so in the same way (AoV will narrow) and if they're the same focal length, should have very similar changes in percentage.
Experimentally, I've seen this with the 3 extending primes I've tested, Canon's FD 50mm f/1.8, EF 50mm f/1.8 STM and EF 40mm f/2.8 STM. Though I'd love to have more data points to add to that list.