I was shooting velvia on a 6 x 7 rollex back at small apertures of f32 or f45 ca lling for 1 sec exposure. I rated the film at 50 which probably would do better at 40. Nevertheless, exposures were dark at least 1 to 1.5 stops under. The mete ring seemed right and contrast not a problem. Could velvia have a light failure problem at one second requiring additional compensation exposure?
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