According to this article on the LF Forum How to Select the F/stop, diffraction limits resolution as follows:
The chart states that if we take a photo at f/22 with a (hypothetically) perfect lens and film, we can get up to 68 lp/mm (just over 1700 line pairs per inch), but no higher. The article points out that these numbers apply irrespective of focal length.
1) If we encounter lens tests made at f/22 which report resolution higher than that number, should we be suspicious ?
2) To effectively scan that (hypothetical) image, would we need a scanner capable of twice that resolution ?
Thank you !
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