So I bought an old View Camera on eBay.
The lens is a C.P. Goerz Am. Opt. Co. Apochromat Artar 6 inch f/9 Serial No: 774611.
The lens has a regular fstop control (f/9-64 ) and it also has thin rotating "control" on the inside of the f stop rim separate from the fstop. It's knurled so it would appear to have or had some functionality and rotates about 90 deg. There is no scale or index. What is/was this for?
Thanks!
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