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>>202293 Perhaps this could be qualified with "certain SLR/lens combos are terrible for street photography"
Prefocusing works best with manual focus lenses that have depth of field marks and distance scales, so you can open up to f/8 or f/11, align one of the relevant DOF marks with the infinity mark on the distance scale, and then read the other DOF mark to the distance where all things begin to be sharp. For extra control, don't align one to infinity so you know that you have a sharpness range of say, three to five meters. Look up "hyperfocal focusing" if my instructions make no sense.
Technically, it's possible with a DSLR, but modern lenses seem to have done away with such high tech things as engravings on the barrel. I'm no Luddite, but prefocusing really does work better with older cameras/lenses.
(Whether it's required for street is a completely different story)
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