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Old 24th December 2021, 10:55 AM
Michael Michael is offline
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Join Date: Dec 2008
Location: Ballinderry Lower, Co. Antrim
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A and C represent respectively the lower and upper limits of colour film range. "After setting the dial for any scene, all objects whose light values fall on or between these two positions will be correctly exposed". U and O are as you thought, I presume for monochrome film.

I quote from Instruction book: Weston Master II model 735 universal exposure meter, no explicit date but I think about 1949.
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