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Blur Inherent to Digital Capture
All forms of digital capture introduce sampling blur because the recording technology is discrete.
This fact means that a small amount of sharpening is always needed to restore some of the inherent contrast (acutance) to edges of a digital photo. When someone says “straight from the camera, no sharpening”, this makes no sense, unless the file truly was processed with no sharpening, which is a bit silly.
Consider the following schematic, representing a 2 X 2 grid of photosites. Each photosite “sees” brightness only, though in a color sensor, two of these will have a green filter, and one will have red, and one blue. But that doesn’t matter for what follows.
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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.
