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Test scene at 50mm

Rangefinder Focus Error With Leica M9 and Zeiss Lenses

Less than perfect focus = blur.

This page shows how critical it is to ensure that the Leica M9 rangefinder focusing alignment is perfect for the lens, because some lenses are simply not set accurately for the Leica M9 digital camera.

For the comparisons on this page, I ruled out user/eye error by using the Zeiss 3X magnifying loupe, which makes it easy to confirm exact rangefinder focus.

This example shot with the Leica M9; see also the extensive Guide to Leica.

Leica M9: Leica M vs Zeiss ZM lenses

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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.

Leica M9 + 50mm f/0.95 Noctilux-M ASPH @ f/2

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