diglloyd
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...

If you’re already a subscriber, CLICK HERE TO LOG IN

diglloyd Advanced Photography

diglloyd Advanced Photography includes hundreds of pages of exclusive coverage and high resolution, Retina-grade example pictures detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare. Also included is a wealth of in-context technique and workflow insight. Since 2006, diglloyd Advanced Photography is the authoritative review and on-line reference for discerning Canon and Nikon shooters. Subscriptions cost $ per year.

  1. Explore the table of contents
  2. Check out Lloyd Chambers’ Blog
  3. Subscribe today!
img
Entire frame as shot at f/2.8 at 200mm

diglloyd Home Page | Terms of Use | PRIVACY POLICY | Contact
Copyright © 2008-2015 diglloyd Inc, all rights reserved.