Hello!!
I'm looking for the flange focal distance of the Optar 90/6.8.
Any idea?
Thank you.
Kind regards,
Antonio
Just measure it, focus it at infinite in a view camera (diafragm open), remove the lens and use a bare caliper to measure from the lens board outer surface to the GG...
or at night (room lights closed) just focus distant spot lights on the wall with max aperture in the lens, take an accurate measure of flange to wall distance, you may rest the lens on a DIY support to be placed on a table, to take the measurement, for example.
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