When calculating magnification ratios, do you use square footage of film or the size of the aspect ratio? In other words, if using a 4x5 camera to photograph something 8x10" in size, is the ratio 1:2 (8 inches is twice as many as 4 inches) or would it be 1:4 (80 square inches of subject being documented on 20 square inches of film)? You'd think I'd know this after this much time taking pics, but I blame this on TTL metering
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