Imagery: Auto - Large Table of Contents

EXCERPT page containing first few paragraphs. 2022-07-05 18:25:06

Mitigating Longitudinal Chromatic Aberration by Stopping Down

Moderate control of secondary color errors requires 2 stops with most lenses, 3 stops for nearly complete control, 4 stops to go neutral.

For example, stopping down an f/2 lens to f/4 eliminates most of the secondary color errors, f/5.6 is nearly neutral, but f/8 is required for strongly defocused areas.

The Canon 50mm f/1.2L is a well corrected lens, as is the 85/1.2L II, but both are from from being free of color errors (not feasible with f/1.2 lenses). With both lenses, stopping down to f/2.8 (2+ stops) controls secondary color fairly well, but aperture f/5.6 is nicely neutral. More defocus would let the color areas linger for longer.

Article continues for subscribers...

Diglloyd Making Sharp Images is by yearly subscription. Subscribe now for about 13 cents a day ($50/year).
BEST DEAL: get full access to ALL 8 PUBLICATIONS for only 68 cents a day ($249.95)!

Diglloyd Making Sharp Images articulates years of best practices and how-to, painstakingly learned over a decade of camera and lens evaluation.

Save yourself those years of trial and error by jump-starting your photographic technical execution when making the image. The best lens or camera is handicapped if the photographer fails to master perfect shot discipline. High-resolution digital cameras are unforgiving of errors, at least if one wants the best possible results.

  • Eases into photographic challenges with an introductory section.
  • Covers aspects of digital sensor technology that relate to getting the best image quality.
  • Technique section discusses every aspect of making a sharp image handheld or on a tripod.
  • Depth of field and how to bypass depth of field limitations via focus stacking.
  • Optical aberrations: what they are, what they look like, and what to do about them.
  • MTF, field curvature, focus shift: insight into the limitations of lab tests and why imaging performance is far more complex than it appears.
  • Optical aberrations: what they are, what they look like, and what to do about them.
  • How to test a lens for a “bad sample”.

Intrigued? See Focusing Zeiss DSLR Lenses For Peak Performance, PART ONE: The Challenges, or (one topic of many) field curvature.

f/1.2 — strongly magenta/green
f/2.8 — much more neutral
f/5.6 — neutral
Canon 50mm f/1.2L

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | Twitter
Copyright © 2022 diglloyd Inc, all rights reserved.