Imagery: Auto - Large Table of Contents

EXCERPT page containing first few paragraphs. 2019-05-20 12:51:15
UA_SEARCH_BOT_null @ 54.227.76.35

Zeiss Loxia 25mm f/2.4 Distagon

MTF for Zeiss Loxia 25mm f/2.4 Distagon from f/2.4 to f/16

MTF wide open at f/2.4 is already outstanding and as good as most lenses achieve stopped down. The falloff to the outer zones is mild field curvature, but actual MTF where in focus even in extreme corners remains nearly as high as at center; see the crops in the various aperture series.

Stopped down to f/5.6, MTF rises to world-class levels in mid and outer zones with minimal astigmatism (superb). This low level of astigmatism is achieved in only the very best 24/25mm lenses.

Curiously, the MTF in the center declines slightly at f/5.6, suggesting a mild focus shift. But given the large gains over the rest of the frame, this is surely part of the “balancing act” needed for such high performance in such a compact optic.

Context: the far more expensive Leica 24mm f/1.4 Summilux-M ASPH cannot even begin to compete with this performance—its peak MTF is lower than the Loxia 25/2.4 and its field curvature and astigmatism are excessive that it is hopeless for any kind of scenario in which one desires even sharpness across the field.

Article continues for subscribers...

Diglloyd Guide to Mirrorless is by yearly subscription. Subscribe now for about 25 cents a day ($90/year).
BEST DEAL: get full access to ALL 8 PUBLICATIONS for only 68 cents a day ($249.95)!

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.

  • Make better images by learning how to get the best results right away. For example, the best way to set up your Sony camera.
  • Save money by choosing the right lens for your needs the first time, particularly with the numerous lenses available for Sony.
  • Make better images, a sort of “cheat sheet” saving yourself months or years of ad-hoc learning—best practices and how-to and processing parameters are discussed and shown.
  • Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to full camera resolution, plus large crops.
  • Real world examples with insights found nowhere else. Make sharper images just by understanding lens behavior you won’t read about elsewhere.
  • 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 as well as extensive blog coverage, for example on Sony.

Aperture series 2.4,5.6 available in full article
MTF for Zeiss Loxia 25mm f/2.4 Distagon

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | Twitter
Copyright © 2019 diglloyd Inc, all rights reserved.