I have taken the lens off of a 1908 Kodak 3a Folder to use on my Speed Graphic. This is a rapid rectilinier type, f4 to f64 in shutter in like new shape and I t ried taping it on to a lens board and it seems to cover 4x5 ok (the camera took roll film orig.) There is no marking regarding focal length anywhere. How or wh at do I measure to find out what focal length this lens is? thanks.
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