henry link
Well-known member
If I'm understanding this correctly, without actually seeing the ISO tables, this is a disappointment to me. I think by far the best information about transmission are full spectral transmission curves. "Night" a "day" transmission are already dumbed down from that, but at least as long as I thought they represented two points along the transmission curve they were of some use in making a crude estimation of the value and shape of the curve between and a little to either side of the points. If, however, night and day are weighted values, so that each one is off the plotted curve by some unknown amount, then they become completely useless for estimating the shape of the curve or the true transmission values. Too bad.
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