diglloyd publication
Imagery: Auto - Large Table of Contents

Loss of Quality Stopping down to f/5.6 - f/11

When I shot the 200mm comparisons, I used mirror lockup and a remote release. Examining the aperture series for the 70-200mm f/2.8L IS II, I noticed that image quality degraded rapidly beginning at f/8, and even somewhat at f/5.6.

The shutter speeds involved were 1/125 (f/5.6), 1/60 (f/8) and 1/30 (f/11), leading me to think of less than perfect solidity as the cause. But this was not consistent with the type of blur, or with other results.

At first I pondered the tedium of reshooting the entire 200mm series, and resigned myself to it, though I could not understand how mirror lockup and a remote release could result in soft images— I’ve done this stuff hundreds of times before.

Article continues for subscribers...

Already a subscriber? CLICK HERE TO LOG IN

Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.

DAP includes thousands of pages of exclusive coverage and high resolution Retina-grade examples detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare, behavioral and practical usage.

  1. Explore the table of contents
  2. View Lloyd’s Blog
  3. SUBSCRIBE NOW for $ per year.
Entire frame as shot at f/2.8 at 200mm

diglloyd Home Page | Terms of Use | PRIVACY POLICY | Contact
Copyright © 2008-2016 diglloyd Inc, all rights reserved.