I recently bought a matched pair of Apo Ronar lenses. They came on a big board, obviously from a process camera. One is a 240mm and the other a 760. Can anyone explain some writing on the aperture scales on the board? On the scale for the 240, it says 'Apo Ronar CL 240-800', and on the other scale it says, 'Apo Ronar CL 760-1200'.
What do the 800 and 1200 signify?
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