I've been testing film speed and development times with a Stoeffer (sp?) step wedge. Expose for zone X with the wedge sandwiched in the holder just above the film.
Does the clear section of the step wedge block any light? Is there a base factor to it? An unexposed sheet of film has Film Base plus Fog. Yet all the testing stuff I've read online seems to be based on the assumption that the top zone on this step wedge is completely clear.
I don't have a densitometer or I'd test it myself.
Thanks,
Mac
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