EXCERPT page containing first few paragraphs. 2021-11-26 15:29:15
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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.
When discussing lens speed (aperture or f-stop, strictly speaking, T-stop), one can fall into the trap of concluding that the Four Thirds format offers a shutter speed advantage in this way:
(FALSE idea) “I can shoot a 150mm f/2 that is equivalent to a 300mm f/2.8 on full frame, therefore I have a full shutter speed advantage”.
Now consider a full-frame 35mm DSLR having exactly the same pixel density as a Four Thirds camera (photosites are the same size). This DSLR would have about 4X the total megapixels. Then assume this DSLR also has a “4/3 crop mode” similar to the DX crop mode on Nikon DSLRs, which crops the frame to Four Thirds format.
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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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