I've picked up a Carlton full plate camera and would like to settle the question of what this lens is. It looks like it came with the camera, or at least is in the same condition as if it had been on for a long time. The shutter it's in is easy to identify as a Bausch and Lomb diaphragm shutter and weighs a ton.
The lens itself is completely unmarked in any place that I could find.
I did the quick "what focal length is this" and it looks to be 12inch to 13inch and should cover full plate, the shutter is marked as F4 for the larger stop.
Presumably circa 1895-ish.
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