EXCERPT page containing first few paragraphs. 2021-04-20 10:06:52
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Pentax K3 firmware version 1.00
In Live View, focusing does not use phase-detect autofocus (a entirely separate system), but instead uses contrast detection off the imaging sensor (CDAF = contrast-detect autofocus).
Well-implemented CDAF offers the best accuracy since the focusing is directly off the imaging sensor (not a separate system). Though it can be slower than phase-detect autofocus, newer sensor designs also incorporate special focusing pixels (the K3 apparently lacks these). Still, CDAF in magnified Live View affords the opportunity for the most accurate focus possible.
K3 Live view general behavior
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