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EXCERPT page containing first few paragraphs. 2019-11-18 11:36:41
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60MP Sony A7R IV

Using Pixel Shift to Capture 4 Frames for Frame Averaging

Sony’s 4-shot pixel shift is so badly implemented* that it is largely useless for work outdoors, where any number of factors cause checkerboarding. It is far too slow, which raises motion issues, and change-in-lighting issues. It is algorithmically flawed, in that that it naively makes 4 exposures literally*.

However, there is a non-obvious useful feature in pixel shift: in effect 4-shot pixel shift can be used to conveniently generate 4 frames, which (after alignment) can be used for frame averaging.

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Diglloyd Guide to Mirrorless offers comprehensive integrated coverage of most APS-C and full frame mirrorless cameras and lenses.

Special emphasis is placed on Sony full-frame, including Sony lenses and the high performance Zeiss Batis and Zeiss Loxia lenses plus Rokinon/Samyang and others. Fujifilm X, Olympus and Panasonic M4/3, Sigma dp Merrill and dp/sd Quattro are also covered in depth. Years in the making, it offers a wealth of material for choosing and using a mirrorless camera.

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Variants Average4Frames,SingleFrame available in full article

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