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Did some testing with my new brass lens. Dallmeyer rapid rectilinear, roughly 1860-1910 was when it was made.
No aperture or focal length info on it. Determined it is around 750mm focal length, wide open it is f11, and with the one aperture slide it reduces down to around f32-f40ish.
Four shots, two scenes with and without aperture slide in place.
Delta 100 @ 50, rodinal 1:50 rotary developer for 10 mins.
First one is wide open.