After scouring through a ton a links and old discussions, for some reason I can't figure out the solution. I am going to the Sierras this weekend for four days to shoot photos, I 50 sheets of Efke 25, 4x5 to go through. From what I can gather, it being a Orthopanchromatic film, it has a reduced red sensitivity compared to a "panchromatic" film such as TMX. So what i'm getting at is, how do I add contrast to a plain ol blue sky? Should I only use a Yellow 15 filter? From what I understand, the compensation for a Red 25 is 8 stops, and does nothing to the sky? I will be using a polarizer, what filter should give me the darkest skies with nice cloud contrast? I pretty much learned that this is not the film to use for dramatic skies, but i'll make do.
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