EXCERPT page containing first few paragraphs. 2017-11-17 12:55:33
UA_SEARCH_BOT_null @ 188.8.131.52
These are measured results of the Otus 85mm f/1.4 APO-Planar. Contrast (MTF) varies with focusing distance with most lenses, and the 85/1.4 Planar is no exception; both infinity and close focus are shown.
Note that measured results at 10/20/40 line pairs/mm should NOT be compared to fantasy diffraction-ignoring computed results at 30 line pairs/mm (as is common practice in much of the industry).
See Field Curvature Analysis (Nikon D810, Mosaic) for a real world example of field curvature at work—how it plays out.
MTF at infinity focus
Micro contrast at frame center when wide open at ƒ/1.4 measures as high as many lenses ever reach. A gentle rolloff is seen to frame edges, which is due to mild field curvature: actual performance is assuredly better than the chart indicates, but slightly out-of-plane. This is a very low level of field curvature for an ƒ/1.4 lens.
Article continues for subscribers...
Diglloyd Guide to Zeiss is by yearly subscription. Subscribe now for about 21 cents a day ($75/year).
BEST DEAL: get full access to ALL 7 PUBLICATIONS for only 68 cents a day ($249.95)!
Diglloyd Guide to Zeiss offers comprehensive integrated coverage of Zeiss DSLR lenses for Canon and Nikon. Nearly a decade in the making, it covers everything you need to know for every lens in the ZF.2, ZE, Milvus and Otus lines. Zeiss mirrorless lenses are covered in Guide to Mirrorless and Zeiss ZM rangefinder lenses in Guide to Leica.
- Make better images by learning how to get the best results right away. A “cheat sheet” saving months of ad-hoc learning—Guide to Zeiss is much more than lens reviews.
- Save money by choosing the right lens for your needs the first time. A year’s subscription covering ALL these lenses is a tiny fraction of the cost of just ONE lens.
- Make better images, a sort of “cheat sheet” saving yourself months or years of ad-hoc learning—Guide to Zeiss spells out best practices.
- Real world examples with insights found nowhere else. Make sharper images just by understanding lens behavior you won’t read about elsewhere.
- Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to 28 megapixels filling up to 5K display, plus large crops.
- 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.
Want a preview? Click on any page below to see an excerpt. And see Lloyd’s essays at Lenspire.Zeiss.com.