EXCERPT page containing first few paragraphs. 2022-08-17 01:32:04
UA_SEARCH_BOT_null @ 35.168.110.128
Focus Shift with the Nikon 14-24mm f/2.8G (Early Tests)
In central areas, the Nikon 14-24 declines in sharpness when stopped down from f/2.8 to f/5.6.
While shooting some field comparisons in summer 2010, I observed that the Nikon 14-24mm f/2.8G declined substantially in contrast from f/2.8 to f/5.6 (see the bristlecone comparison and the road comparison in DAP). I had previously observed this effect, but it hadn’t occurred to me that this could be focus shift, because that’s rare with an f/2.8 lens.
Focus shift to the rear
The Nikon 14-24 is optimized for wide open central sharpness and it offers high contrast without the usual haze. But the compromise was focus shift when stopping down.
Article continues for subscribers...
Diglloyd Making Sharp Images is by yearly subscription. Subscribe now for about 13 cents a day ($50/year).
BEST DEAL: get full access to ALL 8 PUBLICATIONS for only 68 cents a day ($249.95)!
Diglloyd Making Sharp Images articulates years of best practices and how-to, painstakingly learned over a decade of camera and lens evaluation.
Save yourself those years of trial and error by jump-starting your photographic technical execution when making the image. The best lens or camera is handicapped if the photographer fails to master perfect shot discipline. High-resolution digital cameras are unforgiving of errors, at least if one wants the best possible results.
- Eases into photographic challenges with an introductory section.
- Covers aspects of digital sensor technology that relate to getting the best image quality.
- Technique section discusses every aspect of making a sharp image handheld or on a tripod.
- Depth of field and how to bypass depth of field limitations via focus stacking.
- Optical aberrations: what they are, what they look like, and what to do about them.
- MTF, field curvature, focus shift: insight into the limitations of lab tests and why imaging performance is far more complex than it appears.
- Optical aberrations: what they are, what they look like, and what to do about them.
- How to test a lens for a “bad sample”.
Intrigued? See Focusing Zeiss DSLR Lenses For Peak Performance, PART ONE: The Challenges, or (one topic of many) field curvature.
