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EF 400mm f/5.6L USM image quality

Started Jul 1, 2021 | Questions thread
Octopuss
OP Octopuss Regular Member • Posts: 344
Re: EF 400mm f/5.6L USM image quality

After a bit of experimenting, it seems the lens is only able to focus reliably when the subject is at least somewhat in focus. I need to "prefocus" manually and then it focuses pretty quickly, otherwise nothing happens at all and the camera just doesn't recognize anything, which is pretty annoying. Any other lens I tried (and it wasn't too many) at least kept zooming in and out and eventually focused on something. Not this one.

Could be by design, I don't know. At least I believe the thing has decent resell value to it.

 Octopuss's gear list:Octopuss's gear list
Canon EOS 90D Canon EF 16-35mm F4L IS USM Canon EF 50mm F1.8 STM Sigma 85mm F1.4 Art
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