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Secondary Color Correction ('Purple Fringing') vs Zeiss ZM 85/2 and 85/4 (Barn Interior, M240)
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.
Special emphasis is placed on Leica M lenses and certain Zeiss ZM lenses.
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- 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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