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