EXCERPT page containing first few paragraphs. 2019-09-18 20:09:29
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This series examines sharpness on a planar (flat) target at the minimum focusing distance, which is specified as 3.9 inches / 9.91 cm.
The camera was set to manual focus mode, but with magnified AF assist. A Really Right Stuff “nodal slider” was used to slide the camera to the closest point at which the camera would focus, thus finding the true close-focus limit. The quality of the magnified view is so poor that one really has to rely upon the AF system agreeing that it is in focus.
Apertures are “as stated by camera”: it’s unclear if f/2.8 is really f/2.8; if so it would imply a shortening of the focal length. Or it might really be f/3.2 or similar.
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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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