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Author Topic: Canon 40mm F2.8 STM VS Canon 50mm F1.8 STM lens for Video Auto Focus  (Read 1165 times)

Chris L

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I have the Canon 5D Mk4 and will be using the camera's autofocus feature for video. I am wondering if anyone can speak to each of the above lenses AF video capabilities, if one is better than the other etc. On paper I am leaning toward the 40mm since the reports are that it is sharp wide open at F2.8, and that since I will be receiving a 1.6 crop factor while filming 4k I will need a bit more width in the lens field of view. But I am curious if one of these lenses is better than the other solely for smooth AF during video.

FYI, most of my work is with Ursa Mini and Leica R lenses but this is for situations where AF would be useful.
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