I recently latched on to a bunch of Kodak series size filters. Most are of the u sual types (K2, G, 85 Etc.), but a few I can find no info on. They are: 8N5 2D CC 6-15-24-33 (with no color code such as 33Red and so forth) What are they? What were they used for? Thanks.
My answer is based on "Kodak Filters for Scientific and Technical Uses", publication B-3.
8N5 is the combination of a #8 yellow filter with extra neutral density of 0.5 density units. 0.5 density units is light reduction by a factor of 10 to the power of 0.5 = x3.16 = 1.66 stops. So if you use this filter you need to increase exposure compared to just an 8 filter by 1 2/3 stops, or about 2 2/3 stops total.
The Kodak publication lists pale yellow filters of increasing strength 2A, 2B, 2C and 2E. It seems likely that there used to be a 2D. Interpolating between the curves for 2C and 2E, the 2D is probably greatly attenuates wavelengths blueward of about 400 nm.
CC would be color compensating.
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