English: The Carl Zeiss 40mm Triotar lens (on a Rollei B35) referred to in Jacobson's lens tutorial ([1]). The dots represent DOF limits for f/8 and f/16, accorind to the Rollei B35 manual; the dots indicate that the lens is focused at approximately the hyperfocal distance for f/16, about 13 feet. Jacobson's inferred circle of confusion diameter, using , was about 0.025 mm.
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