Read post# 20.
https://www.largeformatphotography.i...ght=elinchrome
This was one way color consistency was achieved back in the day when color transparencies were the prime method for color image printing. Slight color variations do occur within the same manufacture's lens offering. What most did back then was to color match the entire system for a given lens, film, processing, lighting and all involved. The point of reference tool was a calibration certified color densitometer and certified gray card or McBeth color checker.
Bernice
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