Nikon FF v APS-C image comparison

Started Apr 11, 2013 | Discussions thread
paulkienitz
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Re: Surprising?
In reply to Gerry Winterbourne, Apr 12, 2013

Gerry Winterbourne wrote:

The only surprising thing is that he's surprised.  At (near enough) equal FOV and equal MP count it would be astonishing if sharpness wasn't equal: unless one of the lenses was visibly poorer than the other.

But any lens is "poorer" on a small sensor than on a large one.  Part of the advantage of a big sensor is that it's more forgiving of optical flaws.  Like, an 85mm FF portrait lens might have about the same blur circle or chromatic aberration, in absolute terms, as a 50mm APS portrait lens, but it's smaller as a portion of the size of the picture.  For the two to come out the same, the APS lens has to be superior to the FF one, or both have to be better than the sensors they're on, which with today's megapixel counts isn't easy.

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