EXCERPT page containing first few paragraphs. 2020-09-18 22:55:44
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Frame edge on an APS-C sensor is just shy of 12mm offset, so that the 12-15mm distance represents the area beyond frame edge and to the corners.
Wide open, the Zeiss Touit 32mm f/1.8 Planar offers good consistency across the frame with moderate contrast: slightly soft.
Stopped down to f/4, central sharpness is as high as any lens could be.
The wave-like graph shows a graceful drop-off to mid ones following by a move back up: this is likely a field curvature effect quite common with normal lenses. It is probable that actual contrast over most of the imaging area is actually much higher than the MTF chart suggests, but not in a geometric plane, a theory supported by field shots.
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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.
- Make better images by learning how to get the best results right away. For example, the best way to set up your Sony camera.
- Save money by choosing the right lens for your needs the first time, particularly with the numerous lenses available for Sony.
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- Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to full camera resolution, plus large crops.
- Real world examples with insights found nowhere else. Make sharper images just by understanding lens behavior you won’t read about elsewhere.
- 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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