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EF 400mm f/5.6L USM image quality

Started Jul 1, 2021 | Questions thread
Southernapachi Forum Member • Posts: 67
Re: EF 400mm f/5.6L USM image quality

generally speaking not all FF lenses permorm well on a crop sensor. the crop sensor uses only the central part of the lens, so the FF lens must have a very good center resolution to perform well on a crop. On the other side corner to corner the performance tends to be consistent. A good example is my 40mm STM (i know, not in the focal range we are speaking), not extremely sharp but very consistent across the frame already at f2.8

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