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Forum: Pentax K-5 & K-5 II
10-14-2010, 08:25 PM
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You know that calculator doesn't use the megapixel value for anything, right? Put in 1mp then 1,000mp and see if you see a difference in diffraction limit. I don't see how the diffraction limit should be a surprise. I figured that one out a month after I transitioned to digital with the K100D and was shooting with film sunny 16 rules. All my photos were very soft and I wasn't sure why! IMO the practical limit on APS-C is f/11.
As for whether or not the smaller pixels are worse, here's an answer straight from the very page you linked:
"Are smaller pixels somehow worse? Not necessarily. Just because the diffraction limit has been reached with large pixels does not mean the final photo will be any worse than if there were instead smaller pixels and the limit was surpassed; both scenarios still have the same total resolution (although one will produce a larger file). Even though the resolution is the same, the camera with the smaller pixels will render the photo with fewer artifacts (such as color moiré and aliasing). Smaller pixels also provide the flexibility of having better resolution with larger apertures, in situations where the depth of field can be more shallow. When other factors such as noise and depth of field are considered, the answer as to which is better becomes more complicated."
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