EXCERPT page containing first few paragraphs. 2021-10-21 09:50:27
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The Four Thirds and Micro Four Thirds formats differ in the flange to lens distance, but otherwise are identical. The discussion that follows is thus applicable to both.
The focal length discussion shows that the Four Thirds format uses a 1/2 focal length to achieve an equivalent field of view (FOV) to a full-frame DSLR, e.g., Four Thirds uses a 24mm lens to achieve the FOV of a 50mm lens on a full-frame DSLR. This has implications for depth of field.
Depth of field is a function of f-stop, focal length and subject distance. In what follows, the discussion assumes normal working distance, not close-up macro range, where depth of field calculations become more complex. For in-depth coverage of depth of field, see Making Sharp Images.
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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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