EXCERPT page containing first few paragraphs. 2019-02-23 18:16:08
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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.
Stopping down to f/5.6 is strongly advised for geometrically planar subjects such as a distant landscape or building in order to raise the mid-zone sharpness to higher levels. But in general the 32mm f/1.8 Planar is not likely to prove a strong choice for such planar targets, at least not in the f/1.8 - f/4 range.
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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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