Originally Posted by
fishbulb
f/64 is for old lenses where optics are so poor, peak performance really is at f/64, even with the diffraction. f/64 is also for people who don't/can't use movements and need everything sharp front to back. But if you know your Scheimpflug principle, you can shoot at f/16 of f/22 and have front to back sharpness just fine, without the massive resolution-reducing diffraction of f/64. Most lenses designed in the last 30 years are optimized for peak resolution at f/16-f/22 anyway, so stopping down further reduces total resolution.
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