The goal here is to assess whether a modern DSLR lens design for an extreme wide angle lens can perform well on the Leica M Typ 240 rangefinder, which due to ray angle issues (more below) has generally had few choices available for extreme wide angle work, most of them marginal to poor (a notable exception being the Leica 18/3.8 Super-Elmar-M ASPH, but 18mm and ƒ/3.8 is hardly 15mm ƒ/2.8).
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Since 2007, Diglloyd Guide to Zeiss is the authoritative reference and review for all of the Zeiss ZF.2 (for Nikon) and Zeiss ZE (for Canon) DSLR lenses, including the Otus line.
It includes hundreds of pages of exclusive coverage and high resolution Retina-grade examples, in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare, and recommendations and practical usage tips.