EXCERPT page containing first few paragraphs. 2023-03-29 18:35:39
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Optical Aberrations (General)
An optical aberration is optical behavior that fails to faithfully render a point as a point.
- Aberrations are the norm; it’s only a matter of how well controlled they are, particularly at full aperture.
- There are numerous aberrations and they all combine to form the final point spread function which determines the total image quality;
- Stopping down greatly reduces most aberrations, but not all.
The term for the shape of a rendered image of a point source is the point spread function, an excellent term because the word “spread” suggests just what happens: a point of light can be spread around, smeared.
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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.
