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Case Study: Focus Bracketing (Nikon D800 / Leica 100/2.8 APO)

This study shows how very small changes in focus can affect sharpness.

It is difficult to test a lens against itself, since repeated trials will prove that the lens is superior to or inferior to itself, due to tiny changes in focus.

Background

This scene arose while comparing the 36-megapixel Nikon D800 to the D800E. The lens was the Leica 100mm f/2.8 APO-Macro-Elmarit-R (adapted for Nikon mount).

Multiple attempts with Live View using a LCD loupe at full magnification could not quite achieve a focus match.

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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.

Dolls
Nikon D800E + Leica 100mm f/2.8 APO-Macro-Elmarit-R @ f/4

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