1DX crop mode?

Started Dec 7, 2011 | Discussions thread
John Sheehy Forum Pro • Posts: 20,256
Re: 1DX crop mode?

Alex Dawson wrote:

That answers my question very well. I intended to use a sigma 8-16 for underwater photography to get very good corner sharpness at wide apertures... But now I know I have to rethink. Thanks!

Cropping to avoid corner softness can actually be counter-productive. Sharpness is not an absolute quality; it is a quality of scale. Unless the corners of APS-C have at least 1.6x the frequency at the same contrast as the corners of the FF, the crop will be softer in the corners at the same image size.

The corners have to be really and abruptly bad for a crop to have superior corners.

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