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03-22-2007, 09:35 PM   #1
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Edge sharpness with DSLR

People are always talking about edge sharpness vs. center sharpness when evaluating lenses, but does it even matter with digital? With an APS-C sensor, you're pretty much only using the central portion of the image coming through the lens, right? So why should I care about the image quality (and yes, I am aware that sharpness does NOT equal IQ) beyond the center of a lens?

Am I missing something here?

03-22-2007, 11:18 PM   #2
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Sharpness falls of more or less gradually, depending on the lens in question, so for some lenses designed for film sharpness may degrade visibly even within the APS-C sensor size. You may want to take a look at the MTF curves, e.g. on Photodo .
03-23-2007, 03:50 AM   #3
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QuoteOriginally posted by Finn Quote
With an APS-C sensor, you're pretty much only using the central portion of the image coming through the lens, right?
Right, exept when using a "digital only" lense, like DA series...

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