EXCERPT page containing first few paragraphs. 2020-02-25 01:50:21
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Assessment of the SpeedBooster plus a variety of 50mm lenses, all at f/5.6 (since maximum aperture varies so greatly). Certain lenses such as the Nikon 50/1.8 AI could not best tested because they would not mount due to physical reasons.
Aperture f/5.6 is two to five stops closed down for each lens, and represents the peak performance that can be expected (setting aside depth of field). Use of f/8 might make further improvements in some areas via more depth of field. Note that on manual-diaphragm lenses, f/5.6 is marked f/8.
Native optical performance is shown; correction of any lateral chromatic aberration is advised, but has not been done here in order to show the true optical performance as shot.
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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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- Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
- Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.
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