Imagery: Auto - Large Table of Contents

EXCERPT page containing first few paragraphs. 2024-03-29 04:24:23
UA_SEARCH_BOT_null @ 34.237.140.238

For full access, subscribe here. Or click title to login.

MTF Curves

Please refer to Making Sharp Images for discussion and examples of how to read MTF charts, as well as the very real issues of build quality and testing for a bad lens or camera.

The presence of mild astigmatism suggests a trace of lateral chromatic aberration might be present, and this indeed is the case in field shooting. Field curvature might also be present, and the modest performance outside the central 2/3 area (15mm offset) suggest that this lens would best be used on a DX format sensor.

Nikon doesn’t publish MTF other than wide-open, but field shots show a marked improvement at f/5.6, so f/4 should be avoided on full-frame cameras; stop down to f/5.6 if feasible.

Remember that a real physical lens can only approach its as-designed specifications, and might not meet this ostensible performance level due to build variation/errors.

Article continues for subscribers...

Diglloyd Advanced DSLR is by yearly subscription. Subscribe now for about 16 cents a day ($60/year).
BEST DEAL: get full access to ALL 8 PUBLICATIONS for about 75 cents a day!

Diglloyd DAP is DSLR-oriented, but also contains workflow and other topics. Much of the focus is on Canon and Nikon but also Pentax and Pentax medium format.

Special emphasis is placed on lens evaluation, focusing on Canon and Nikon and Sigma lenses, but with a few others like Rokinon/Samyang.

  • Make better images by learning how to get the best results right away.
  • Save money by choosing the right lens for your needs the first time, particularly some of the new Sigma Art lenses vs Nikon and Canon.
  • Workflow discusses image organization, raw conversion and post processing. Many examples show processing parameters for direct insight into how the image was converted.
  • Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to full camera resolution, plus large crops [past 2 years or so].
  • 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 Nikon or on Canon or on Pentax.

MTF for 24-120mm f/4G ED VR at 24mm
MTF for 24-120mm f/4G ED VR at 120mm

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