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EXCERPT page containing first few paragraphs. 2017-02-26 08:47:45

Leica 50mm ƒ/2 APO-Summicron-M ASPH

Skewed Plane of Focus

June 2013 lens sample, which suffered from poor flare control.

With a variety of shots, I had noticed an odd plane of sharpness that appeared to cut from the distance at left towards the foreground at right.

Seeing this with only one or two images, I chalked it up to a visual misunderstanding of subject distance, albeit with an uneasy feeling. But too many images cropped up with this effect to dismiss. Of course, aperture ƒ/2 shows it most clearly, so that many images made stopped down mask the effect also.

Ancient bristlecones

Where it is sharp, the sharpness is really impressive!

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ƒ/2 @ 1/1500 sec handheld, ISO 200
Leica M240 + 50/2 APO-Summicron-M ASPH
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