The largest blur spot that still looks like a sharp point at a given print size and viewing distance. It sets the limits used in depth-of-field and hyperfocal calculations (about 0.030 mm for full frame).
The largest blur spot that still looks like a sharp point at a given print size and viewing distance. It sets the limits used in depth-of-field and hyperfocal calculations (about 0.030 mm for full frame).