The Beck has 1" back focus

Thanks guys, obviously I not an lens expert

I will try them all slowly with historic film. aka X-Ray

Quote Originally Posted by Mark Sawyer View Post
Chauncey's right about the 11.5-inch focal length of the Beck lens being about right for whole plate. I still suspect it's just a normal RR sold by Walmsley.

Which lens has the 1-inch focal length? And is that the focal length or the back-focus?