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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.

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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.

Variants 2_8, 5_6 available in full article
Crop at center at f/2.8, mouse over for f/5.6

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