EXCERPT page containing first few paragraphs. 2021-06-21 13:04:45
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PDAF = Phase Detect AutoFocus
The latest and highly dubious trend with digital sensors is adding special pixels on the sensor to allow phase detect autofocus. These special pixels don’t come free: they invariably lead to image quality impacts of the kind that either must be suppressed (as with the Nikon Z7 and other cameras), or let alone to pop up in the wrong image—see for example Sony A9: Two Examples of Pattern/Banding Noise at ISO 100 (Pine Creek Skyline, Mt Tom).
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These systems are hugely expensive, so make the right choice for your own needs (full frame vs medium format).
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