diglloyd publication
Imagery: Auto - Large Table of Contents
Nikon 70-200/2.8 VR II and 70-200/4 VR
Nikon 70-200/2.8 VR II and 70-200/4 VR

Comparison: Focus Shift at Close Range

This is a close range test at a reproduction ratio of about 1:12, equivalent to a tight head and shoulders portrait. Using the Nikon D800E in FX (full frame mode).

Focus accuracy

At 200mm, the margin of error for focus here is about ±2mm at ƒ/4, a fact evident simply by viewing the ruler (on which a marked 1cm corresponds to ~5-6mm of camera distance due to the its angle relative to the camera).

Accordingly, this series was focus bracketed for one lens (the 70-200/2.8G VR II) and two of four of those attempts are shown versus the 70-200mm f/4G VR.

The focus bracketing was made even more critical by the sharpness-destroying focus shift of the 70-200/2.8G VR II at this range, a defect that one might reasonably consider unacceptable, and a reason to prefer the ƒ/4 lens, which also does not suffer from the absurd focal length shortening problem of its ƒ/2.8 sibling.

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!
Actual Pixels, Focus

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