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EF 400mm f/5.6L USM image quality

Started Jul 1, 2021 | Questions thread
Trevor Sowers
Trevor Sowers Senior Member • Posts: 1,605
Re: EF 400mm f/5.6L USM image quality

Octopuss wrote:

Maybe it behaves as intended/expected and I am just describing it incorrectly.

If you intentionally misfocus the lens and try to focus at something that's as blurry as possible, what happens? Does it focus at all and if so, how long does it take?

If the subject is too small in the viewfinder then it's possible that it is trying to focus on a busy background.

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