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Fine Tune Autofocus for Each Lens

Use your camera’s autofocus adjustment to teach the camera to work with each lens more accurately.

Many recent DSLR cameras from Canon and Nikon now offer a fine focus adjustment, which can be set globally and/or on a per-lens basis.

The fine focus adjustment causes the autofocus system to bias the focus accordingly, helping to compensate for a disagreement between lens and camera. But if a camera is not 100% consistent, all such a feature can do is reduce the range of error. Focus error in general is distance-dependent, so any focus adjustment is only a biasing factor, not a perfect solution.

Canon “AF Microadjustment”

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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.

Canon 5D Mark II fine focus adjust.

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