Imagery: Auto - Large Table of Contents

EXCERPT page containing first few paragraphs. 2023-03-25 02:56:55

Extreme purple fringing
(Leica M9 + Noctilux-M ASPH)


The net effect with a wide aperture image is the sum of many optical properties: sharpness and contrast, bokeh and color bokeh, lens aberrations, field curvature, the haze of spherical aberration.

The bottom line for wide aperture shooting: understand your lens, and realize that it’s the overall visual impact that matters, not absolute sharpness. If you’re after peak sharpness, shoot at f/8.

Even the very best fast lenses have considerable aberrations wide open, which makes focus somewhat ambiguous, particularly off-center (though spherical aberration affects the entire frame). Therefore, the expectations for crisp and contrasty results must be reduced. This is true even for the US$10,500 Leica Noctilux-M ASPH, which has a truly exotic optical design, with numerous special elements (correcting an f/0.95 lens is far more stringent than for an f/1.4 lens).

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Diglloyd DAP is DSLR-oriented, but also contains workflow and other topics. Much of the focus is on Canon and Nikon but also Pentax and Pentax medium format.

Special emphasis is placed on lens evaluation, focusing on Canon and Nikon and Sigma lenses, but with a few others like Rokinon/Samyang.

  • Make better images by learning how to get the best results right away.
  • Save money by choosing the right lens for your needs the first time, particularly some of the new Sigma Art lenses vs Nikon and Canon.
  • Workflow discusses image organization, raw conversion and post processing. Many examples show processing parameters for direct insight into how the image was converted.
  • Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to full camera resolution, plus large crops [past 2 years or so].
  • Real world examples with insights found nowhere else. Make sharper images just by understanding lens behavior you won’t read about elsewhere.
  • Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
  • Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.

Want a preview? Click on any page below to see an excerpt as well as extensive blog coverage, for example on Nikon or on Canon or on Pentax.

Color bokeh: magenta/green edges and/or magenta/green “gumdrops”
(Leica M9 + Noctilux-M ASPH)

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