EXCERPT page containing first few paragraphs. 2022-01-22 22:22:25
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The Metabones SpeedBooster* optically reduces the projected image from a lens designed for a larger sensor to a smaller image that covers a smaller sensor (“focal length reducer”).
Since by definition f-stop is a function of focal length, a .7x Reduction in focal length equates to a one-stop increase in f-stop: f1.4 becomes f/1.0, f/2 becomes f/1.4, etc. But the SpeedBooster also increases MTF, which means in general that image quality ought to be higher than an adapter which performs no optical reduction.
The SpeedBooster focal length reduction is made possible by a short flange focal distance which allows an adapter to go in between the DSLR lens and the body. Cameras such as Sony NEX, Fuji X, and the Olympus E-M5 (MFT) work for this reason. But it will NOT work on any DSLR because of the mirror box and the distances/offsets involved.
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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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