Imagery: Auto - Large Table of Contents

EXCERPT page containing first few paragraphs. 2019-05-21 06:45:13
UA_SEARCH_BOT_null @ 3.87.147.184

42MP Sony A7R III
Zeiss Batis 40mm f/2 CF
Zeiss Batis 40mm f/2 CF

Longitudinal and Secondary Longitudinal Chromatic Aberration

This page evaluates longitudinal chromatic aberration (LOCA) and secondary longitudinal chromatic aberration (SLOCA), two bugaboos of image clarity.

Lenses lacking adequate correction for these two forms of secondary color deliver images with violet haloes on backlit subjects (see this comparison) and also deliver a magenta cast to the out of focus foreground and a green cast to the out of focus background, both highly undesirable.

Example #1: Bishop Creek

This image was deliberately shot with the background out of focus. The lighting was extremely blue mountain shade at dusk, which provokes the violet haloes of LOCA in lenses that do not adequately correct for secondary color.

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.

f2 @ 1/25 sec IS=off, ISO 100; 2018-10-18 18:11:17
[location “Bishop Creek”, altitude 8600 ft / 2621 m, 38°F / 3°C, LACA corrected]
Sony A7R III + Zeiss Batis 40mm f/2 CF

[low-res image for bot]

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.