EXCERPT page containing first few paragraphs. 2017-04-24 00:25:50
UA_SEARCH_BOT_null @ 188.8.131.52
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.
Article continues for subscribers...
Already a subscriber? CLICK HERE TO LOG IN
Since 2009, Diglloyd Guide to Mirrorless covers mirrorless cameras and lenses. Includes interchangeable lens camera systems (Sony, Fujifilm, Olympus, etc) as well as fixed-lens cameras (Sony, Sigma, Ricoh, etc).
In addition to the manufacturer-brand lenses, lens coverage includes 3rd-party lens lines like Zeiss Touit, Zeiss Loxia and Zeiss Batis.
It includes hundreds of pages of exclusive coverage and high resolution, Retina-grade examples for the new mirrorless camera systems from Sony, Fujifilm, Olympus, Sigma, Ricoh and more. Also included are operational concerns, like shutter vibration or other camera behaviors. This publication will play a decisive role in your selection and use of mirrorless cameras and lenses.