EXCERPT page containing first few paragraphs. 2021-05-14 04:03:12
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Sony states 14 bits for its imaging chain. But this is not so for the raw files: 14 bits for 36 megapixels means a minimum file size of 36 X 14/8 = 63 megabytes (without compression). Therefore, a smaller file size implies compression of some kind.
Yet the A7R consistently produces 37.x megabyte files. The ONLY way this can happen is by lossy compression (data loss): when the maximum file size is a fixed size, only lossy compression can deliver a guaranteed size*. And that might result in subtle degradation to image quality in transitional areas (Sony’s delta compression), which is a possible explanation for the “rough” transitions in the Agapanthus example.
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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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