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Blur Caused by Digital Capture

All forms of digital capture introduce sampling blur because the recording technology is discrete.

A digital sensor cannot detect any detail within a photosite. As shown below, detail within a photosite turns to some intensity of gray or color; all internal detail is lost, which also means that a line spanning two adjacent photosites cannot be resolved; at least 3-4 photosites in one direction are needed.

For more on this topic, see Sensor Technology — Blur Inherent to Digital Capture.

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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.

Discrete sampling; no detail within a photosite!

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