Imagery: Auto - Large Table of Contents

EXCERPT page containing first few paragraphs. 2019-05-25 13:33:05
UA_SEARCH_BOT_null @ 54.227.76.35

Leica MTF Examples

Examples on this page are from Leica lenses. Leica’s MTF charts are among the very best for useful information (Zeiss also).

Measurement distance is infinity for Leica MTF charts (unless otherwise noted). Leica MTF charts are for 5/10/20/40 line pairs per millimeter, yielding a very useful overall signature . They can be compared with Zeiss charts using the 10/20/40 lines.

Example — Leica 2010 35mm f/1.4 Summilux-M ASPH

The Leica 2010 35mm f/1.4 Summilux-M ASPH represents state of the art lens design. But like all lenses, it has compromises, and the MTF is very revealing of strong field curvature at ~ f/2.8, which must be kept in mind when shooting flat (planar) subjects.

Contrast rises considerably from f/1.4 to f/2.8, but with a large dip in mid-zones, due to field curvature. Stopping down to f/5.6 brings a sharp plane into focus as revealed by a more level MTF graph, but remember that the zone of sharpest detail is still just that— a zone centered around a 3D curve. Actual contrast appears to reach 80% at 40 lp/mm, which is world-class.

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.

Aperture series 1.4, 2.8, 5.6 available in full article
Aperture series 2.5, 5.6 available in full article

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.