EXCERPT page containing first few paragraphs. 2019-08-25 10:13:19
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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).
This page shows troublesome pattern noise in a good exposure. The Fujifilm GFX100 cannot capture some shades of blue sky without visible pattern noise, apparently due to the inclusion of its PDAF pixels.
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