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<p>[QUOTE=&quot;SuperDave, post: 2260354, member: 1892&quot;]You have a point; I was not contemplating how dense physics-fan&#039;s camera sensor was. The pixel pitch of a T3i means it&#039;s diffraction-limited at f/6.8 so the magnification for a Morgan (for instance) of 0.42x means your effective aperture at a set f/5.6 would be f/7.95, into diffraction for this sensor. Doesn&#039;t mean you should back off the aperture and stack shots; it just means you want to tread carefully and look at 100% crops in this setting range. Many lenses are enough sharper at f/8 than f/4 to offset any loss from diffraction.</p><p><br /></p><p>And don&#039;t forget, we&#039;re talking about the last 5% of quality here. With an 18MP dSLR, you&#039;re radically downsizing images to post online, which adds apparent sharpness to the image as well. Look at the diffraction limit as a caution, not a hard stop.[/QUOTE]</p><p><br /></p>

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