EXCERPT page containing first few paragraphs. 2020-04-09 20:11:01
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Color aberrations fall into two primary areas:
- Lateral chromatic aberration (LACA) — typically red/cyan color fringing worsening towards edges/corners, never an issue at center on a properly assembled lens. Does not improve with stopping down.
- Longitudinal (axial) chromatic aberration (LOCA) and secondary longitudinal chromatic aberration (SLOCA) [user interchangeably here] — rapidly improves with stopping down because it is a differential focus by color (“color depth of field”).
For more on chromatic aberrations, see Making Sharp Images.
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Diglloyd Guide to LEICA contains in-depth coverage of Leica M system cameras and lenses, with additional coverage of Leica M Monochrom, Leica Q, Leica SL.
Special emphasis is placed on Leica M lenses and certain Zeiss ZM lenses.
- 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 the Summilux/Summicron/Elmarit choice and/or Zeiss ZM.
- Make better images, a sort of “cheat sheet” saving yourself months or years of ad-hoc learning. Processing parameters are discussed and shown.
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- 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.
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