EXCERPT page containing first few paragraphs. 2020-04-09 16:15:54
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June 2013 lens sample, which suffered from poor flare control.
Tests of the Leica M Monochrom showed that the use or orange and deep red filters led to a very significant rearward focus shift, with red wavelengths backfocusing substantially. See Filters and Focus Error / Sharpness.
Lighting color temperature was around 6000°K for this test. This might have a bearing on the amount of focus shift, see Focus Shift with Color Filters on M Monochrom.
Focus shift in visible and with deep red filter
The Michael Tapes Lens Align target was used here for convenience is seeing the focus shift issues. The crops below are actual pixels.
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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, Leica SL.
Special emphasis is placed on Leica M lenses and certain Zeiss ZM lenses.
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