Imagery: Auto - Large Table of Contents

EXCERPT page containing first few paragraphs. 2023-03-29 19:42:24

Leica S2

Field Confirmation of Autofocus Error with Leica S2

Less than perfect focus = way less than potential resolution.

This page documents autofocus error in the field for landscape photography with the Leica S2 using the 35mm, 70mm and 120mm lenses in October 2010. The S2 body and lenses used were provided by Leica USA, and showed similar issues to a body used in July 2010.

It is not my view that such issues are unique to Leica, or to any manufacturer. They are a fact of life. However, Nikon and Canon have had 20 years to perfect autofocus, and I expect far fewer issues than with the new kids on the block, medium format cameras.

The S2 autofocus system frequently backfocuses by an amount that requires stopping down to f/8 to mitigate. (Backfocus means focusing behind the subject).

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  • Depth of field and how to bypass depth of field limitations via focus stacking.
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  • Optical aberrations: what they are, what they look like, and what to do about them.
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Intrigued? See Focusing Zeiss DSLR Lenses For Peak Performance, PART ONE: The Challenges, or (one topic of many) field curvature.

Actual Pixels
Leica S2 + 120mm f/2.5 APO-Macro-Summarit-S @ f/2.5, 1/4000

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