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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