EXCERPT page containing first few paragraphs. 2021-04-20 09:42:26
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All cameras and lenses with phase detect autofocus (conventional autofocus) have factory tolerances for accuracy. With high resolution digital sensors, the tolerances must rise due to the extreme pixel density: the 24MP sensor in the Pentax K3 has a pixel density equal to a 56MP sensor on full frame.
One can fairly ask a simple question: if a brand-new camera and brand-new lens are acquired, shouldn’t the focus be close to perfect? Unfortunately the answer is generally “no”, because the factory tolerances are not particularly tight, and because a lens error and a camera error can be additive or subtractive; a small error plus another small error in the same direction mean an unacceptable result.
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Diglloyd DAP is DSLR-oriented, but also contains workflow and other topics. Much of the focus is on Canon and Nikon but also Pentax and Pentax medium format.
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