Imagery: Auto - Large Table of Contents

EXCERPT page containing first few paragraphs. 2019-09-23 11:44:29
UA_SEARCH_BOT_null @ 18.207.136.184

Faint Traces of Lateral Chromatic Aberration

Digital sensors adds a complicating factor in amplifying both astigmatism and LACA; see Astigmatism and Digital Sensors.

Lateral chromatic aberration generates red/cyan color fringes due to lateral displacement by wavelength (color) and does not improve with stopping down. Sometimes this color fringing is very low, and might only be visible on high resolution digital cameras (e.g. 36 megapixels on up) and/or on high contrast edges.

Example

This example shows a faint color fringing at the +10mm offset (see the actual pixels crop, the white building middle left), which is where the MTF chart shows the most divergence between sagittal/tangential lines (astigmatism), the divergence in this case apparently being the result of the color fringing. Interesting to note is that the color fringing is not visible at the edges, showing that lateral chromatic aberration can “come and go” depending on where on looks in the frame.

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.

Nikon D800E + Zeiss 55mm f/1.4 APO-Distagon @ f/4

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.