Densitometry - blue filters
Assuming the use of graded silver papers, reading stained negatives using the blue channel on a color densitometer is said to give reasonably useful readings. My understanding is that the blue channel utilizes a filter corresponding to wratten #94. Anyone know what the transmittance curve (ie transmittance % by wavelength) looks like for a wratten 94? I don't have one (nor do I own a color densitometer) so I was planning on trying my black and white densitometer with a #47 as many people have done. I know what the transmittance curve is for the #47, and I assume the #94 passes a narrower band, so my thinking is the #47 should give results at least as useful as color densitometer would. Opinions?