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.
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Topcon 135/3,5 RE Minolta Rokkor 500/8 Topcon 135/3,5 RE ROW Visionar 154/1,9
my wife's shot This morning, Merapi volcano erupted, see ashes in leaves Taken with EOS 650 + Lucky BW 100 film ...
Got this lens in ugly condition, fungus, paint loss everywhere, infinity achived but not same as letters written, aperture stuck wide open....