I can’t seem to find any information on the web concerning this lens. The thing that’s really throwing me off is the fast aperture of this lens (it looks like f2.3 but it might actually read f2.8 or f2.9), and yet it came off an old 5x7 large format camera. There is no indication on the lens of the focal length.
Here’s what I know... It is a C.P. Goerz Berlin Doppel Anastigmat mounted in a Wollensak shutter. The Goerz serial number (87312) indicates that it was made around 1902, while the Kodak No. 5 Cartridge 5x7 camera that it was mounted on would have been made between 1898 and 1900. The front element of the lens is about 30mm in diameter and the inner diameter of the opening of the brass lens is about 46mm.
It would be very helpful to know what the focal length of this lens is, and also if it is rare/valuable.
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