I have a question regarding this site's diffraction limit calculator:
1. It says it compares the Airy disk diameter with the circle of confusion (CoC). However, I don't see any settings that are pertinent to the CoC calculations - like the lens focal length and the focus distance.
2. It does not look like that the results depend on the pixel size (the number of Mp). I can change the Mp anywhere from 0 to 100 MP and the diffraction limit has not change. I would assume (maybe naively) that if the pixel size is sufficiently large it can become the limiting factor and not the DOF or diffraction.