Imagery: Auto - Large Table of Contents

EXCERPT page containing first few paragraphs. 2023-12-02 00:31:57

Click for actual pixels

Focus Shift with 28mm Lenses

This pages offers an extensive study of focus shift with 28mm lenses.

Test scene

The 36-megapixel Nikon D800E was used in DX-crop mode as shown below (115 cm distance). Focus was on the doll’s eyes, with the ruler as a reference point for observing the amount of focus shift. The doll’s eyes correspond to roughly the “9” mark on the ruler.

All of the lenses were shot without changing the tripod position except for the Leica 28mm f/2.8 PC-Super-Angulon, which was shot later. Lighting variations are present due to varying nighttime/daytime fill light, but the primary illumination was dual halogen lamps. The lenses do not all have the same focal length, even though all are nominally 28mm.

Important notes and caveats:

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.

Test scene with ruler

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.