Originally Posted by
Sevo
Do ignore the fact that the values on the needle meter and upper scale show numbers resembling a aperture scale! There was one shutter speed at one film speed (perhaps Kodachrome amateur silent cine film, 1/30@64ASA, if I interpret it right) where the needle meter could be used for direct readout. For all other applications (in particular photography) these are just arbitrary numbers you have to match up between scale and calculator - the apertures you have to use are down below, paired with the exposure times.
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