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Focus Shift with the 50/2 APO ASPH (Dolls)
June 2013 lens sample, which suffered from poor flare control.
Leica 24-megapixel M240 at ISO 200, full-range optimal exposure, approximate 1:11 reproduction ratio.
This meticulously-executed test used a focusing rail to bracket focus in 2mm increments in order to evaluate peak sharpness and focus shift— necessary for an ultra high performance lens.
This study should not be construed as applying to midrange or infinity focus; behavior of many lenses varies with focusing distance.
Also, even the best lenses have some weakness. The 50/2 AA is clearly a very high performer, but it is not perfect.
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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.
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.
- 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.
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