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EF Lenses on R Mount (f/1.2 portrait primes)

Started Jun 20, 2020 | Discussions thread
CESA Contributing Member • Posts: 601
Re: EF on an RF Mount (f/1.2 Primes)

"Be wary of copy-variation from both EF lenses because they were known to be problematic occasionally. When I bought my EF 85mmL lens it needed to be replaced the following day due to massive back-focus problems. For example, it would focus two inches beyond a closeup subject and three feet from a subject 40 feet away. This was adjustable via the MFA setting on my DSLR camera but I was right at the very limit of my MFA adjustment settings with no room to move. I then managed to select a new model from three other new lenses and was extremely satisfied with the results. In theory, backfocus ought not to be a problem with mirrorless lenses. Yet some folks complain that their EF lens with back-focus issues can occasionally struggle to nail focus on a mirrorless camera. Usually, this always/only applies to f/1.2 lenses."

Marco can you elaborate more here? I have the.EF 8m f/1.2L II and I feel like that some times I miss the focus. I haven't fully calibrated the lens using FoCal but once I do that I will do some experiments because I feel like I have the issue you have just described. Because I haven't calibrated the lens can't conclude anything. However in my case it looks like it is not front focusing.

What did you do to the copy that you were experiencing this?

How do you go around this problem without having the luxury of selecting from 3 different lenses the one that performs best?

Can this be sent to canon to get fixed? What causes this? The lens still in the warranty and it was bought from a used shop.

Thanks

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