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EXCERPT page containing first few paragraphs. 2021-09-20 18:45:33

Leica 28mm f/2 APO-Summicron-SL ASPH

Flare for Leica 28/2 APO-Summicron-SL ASPH

The Leica 28mm f/2 APO-Summicron-SL ASPH generally has excellent flare control. But it is readily seen that with a bright light source just out of the frame, a major loss of contrast develops.

Example: backlit sunflowers

The example here is repeatable at will with any similar scene.

I used my hand to shade the front lens element in the Shaded frame. The slight framing difference is immaterial, as I determined in real time shading/unshading the lens.

A major loss of contrast is seen when the front lens element is not shaded—considerable veiling flare as well as a streak seen near the top of the frame. This weakness can be seen to disappear if the sun is further out of the frame, and it’s also better when the sun is in the frame. Thing is, the sun just out of the frame is a very common shooting angle for me in the outdoors. So the lens must be shaded for many shots.

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