EXCERPT page containing first few paragraphs. 2019-06-17 00:59:20
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Assessment of the SpeedBooster + Canon 15mm f/2.8 fisheye using manual focus at maximum magnification for accuracy.
Two frames are considered: wide open at f/2 and stopped down to f/5.6. Aperture f/5.6 is three stops down 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.
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.
Depth of field, focus shift, field curvature, alignment of camera to target all influence sharpness; focus was on the “HG-X Chain Only” lettering on the crankset.
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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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