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EF 100mm f/2.8 USM macro. Soft on full aperture?

Started Sep 17, 2016 | Discussions thread
J A C S
J A C S Forum Pro • Posts: 20,544
Re: EF 100mm f/2.8 USM macro. Soft on full aperture?

User8673440952 wrote:

Is the lower resolution of 1D III key for seemingly better performance?

Like 20 vs. 22 mp? No, that is hardly noticeable. Compare 18mp APS-C and 20mp FF then.

The same lens on crop will be always softer than the same one on FF unless the FF has a much lower pixel count, like 12mp, etc. Even the borders will be softer most of the time.

I own the 100L and I have used another copy on my 50D in the past. It was sharp enough, no complains but it was not "razor sharp" wide open. See also this.

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