EXCERPT page containing first few paragraphs. 2017-09-22 18:55:20
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Wide open at f/2.8, MTF is outstanding, among the best lenses available and showing a higher and flatter (better) MTF curve than the Zeiss Milvus 135mm f/2.
The Batis 135/2.8 is nearly at optimal performance wide open! Going to f/4 makes a small improvement in edge to corner areas with f/5.6 adding no benefit.
At f/8, micro contrast (lowest pair of lines) begins to drop due to diffraction. At f/11, the curves are all flatted to nearly straight lines and drop substantially, indicating performance limited by diffraction.
At f/16, performance is massively degraded by diffraction; avoid f/16.
There is no indication of any focus shift. This is a superlative performance that makes it a reference lens for this focal length 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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