Just purchased a LF/MF lens off of the famous online auction site and need help figuring it out. Lens/shutter combo is a super crisp Regno shutter with what appears to be 2 removable lens elements with the front lens marked as follows " 4 1/4" 6 1/8" Rapid Orthographic F8". The aperture scale on the face of the lens has 3 scales as can be seen in the attached picture. What I am trying to find out is what are the focal ranges of this lens and how would I achieve them. I currently own a nice 210/365mm convertible lens that shifts between the 2 focal lengths by removing the rear element. Any information provided would be greatly appreciated. Thanks
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