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Originally Posted by - Paul -
Not something I've heard of - what is it? Do I need to do a google?
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http://www.aguntherphotography.com/t...esolution.html
Here's the one of many that I've read, that I think has the best illustrations. Generally, as your pixel density goes up, diffraction limits become more of a problem. So, a 7D will reach it's diffraction limit sooner than a 5D MkII or MkIII, because of it's extremely high pixel density. Nikon's new D800 isn't far behind.
It's NOT a brick wall that you hit and suddenly everything is crappy. It's more like, "the limit" is where you can start to detect diffraction with you eye if you look at 100%. It does get worse as you use a smaller and smaller aperture, so f/64 would be extreme with almost any camera/lens combination.
Try that shot at f/64, f/16 and f/8 and f/4. Focus on the very tip of the pollen. At the wider apertures, the DOF will be razor thin, but what's in focus will be super sharp. As you get around f/16 and look at 100%, you'll start to see loss of sharpness.
The problem is aggravated the most with super-teles and macro lenses at their minimum focus distances.
Dave