Imagery: Auto - Large Table of Contents

EXCERPT page containing first few paragraphs. 2020-12-01 13:00:25
UA_SEARCH_BOT_null @ 3.236.156.32

Enable javascript for this site to show Retina images, aperture series, image toggles, topics page menus and more.

Canon 100mm f/2.8L: Blur example

I’ve previously documented difficulties in obtaining both Canon and Nikon lenses— right out of the box lenses showing a variety of optical problems. See Brand-new Blur.

This particular sample was shipped from B&H Photo in New York City to me in California. Could shipping damage a lens? It seems rather doubtful the way the lens is packed in its box, and if it were so easy, no lens would survive very long in real usage. So I think it’s fair to assume that Canon’s quality control is at fault, which is consistent with past experience.

What can be learned from a bad sample?

I made several comparisons with the 100/2.8L in Yosemite (to cross-check as I always do), enough to show a problem, documented here on this page. The problem can vary in degree, depending on where the lens is focused. Even when a lens is “off” some conclusions can be drawn. For example, central sharpness is top-notch with the 100/2.8L, even wide open.

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 only 68 cents a day ($249.95)!

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.

Entire frame as-shot at f/2.8 on the Canon 5D Mark II

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | Twitter
Copyright © 2020 diglloyd Inc, all rights reserved.