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Leica M Typ 240
Leica 18mm f/3.8 Super-Elmar-M ASPH

Flare Behavior Across Apertures (Beaver Pond, M240)

The 18mm f/3.8 Super-Elmar-M ASPH has a bulging front element. A bright light source such as the sun can graze this front element and cause flare spots. Shield the lens from any such light source, though there is little margin for error without intruding into the frame.

A question that often arises is whether stopping down reduces flare. The answer is “it depends”: sometimes a lens benefits by stopping down one stop; this cuts off certain reflections. And other times (as shown here), more diffuse flares can become much more prominent.

Wide open the flare is diffuse enough that a casual glance will not perceive it other than veiling flare. Stopping down, that apparent veiling flare quickly takes form as various types of ghosting flare.

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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.
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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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Aperture series 3.8, 5.6, 8, 11, 16 available in full article

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