Almost all lenses have something written on it description of focal length (eg. 50mm or 2inch) and it's capability to let light through (eg. F1,4). Projection lens also has this. But not this Dallmeyer lens.
Samyang 12/2 Steinheil Munchen 135/3,5 Yashica ML 55/1,2 Steinheil Munchen 135/3,5 Minolta 500/8 Rokkor
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