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EXCERPT page containing first few paragraphs. 2017-04-24 00:25:50

Zeiss Batis 135mm f/2.8 APO-Sonnar

MTF for Zeiss Batis 135/2.8 APO-Sonnar

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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In addition to the manufacturer-brand lenses, lens coverage includes 3rd-party lens lines like Zeiss Touit, Zeiss Loxia and Zeiss Batis.

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MTF for Zeiss Batis 135mm f/2.8
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