EXCERPT page containing first few paragraphs. 2021-04-13 04:14:45
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Leica supplies data for f/1.3 (not f/1.2)... is it a typo or is it actually f/1.3?
However, the true illuminance on a digital sensor can be even less than the optical performance suggests, due to ray angle. Even in the center, actual illumination at full aperture is likely to be around T/1.4. Which makes on wonder about the wisdom of bothering with f/1.3 (1.2).
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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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