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Distortion
Distortion is low for a 28mm f/2 lens, but shows up on buildings or even horizons. Yet few 28mm lenses have distortion this low, excepting its exceptional 28/2.8 sibling.
The distortion is not strictly uniform barrel distortion; it “flattens” slightly at about 2/3 from center. This could make it more difficult to correct in software, but it is probably close enough.
The 1.2% distortion is very low for an f/2 lens, and on most subjects it will not be detected by the eye— except for architecture, see the examples with its 28/2 predecessor, which performs identically.
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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.
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