Imagery: Auto - Large Table of Contents

EXCERPT page containing first few paragraphs. 2023-12-02 01:03:38

Leica S2

Autofocus Error with Leica S2

Less than perfect focus = less than potential resolution.

I shot a series using autofocus, shooting an aperture series from f/2.8 through f/22. I then manually focused by eye and then shot the same aperture series. the focus was at center of course, since that’s the only place the S2 can focus.


This scene should be a “no brainer” for autofocus: a high contrast sunlit area. It was not difficult for me to focus by eye, so why is it that autofocus get the job done? Because that’s the way autofocus often is— unreliable accuracy that does not deliver the full sharpness potential. And not just the Leica S2, which autofocuses on this scene about as well as any other brand.

If you’re eyeballing a camera like the Leica S2 for its higher resolution and great S lenses, you won’t get the results you want when autofocus can’t deliver! See the full review of the Leica S2 in Guide to Leica.

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  • 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.

Leica S2 + Leica 70m f/2.5 Summarit-S ASPH

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