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What is the best correction filters for shooting daylight film with tungsten lights? I have been using 80B blue filter but results are not really entirely adequate because the walls stilol show a yellowish and beige type tint. Would 80C filter blue be better or better yet is there any other blue filter no. that would render the walls in particular a realistic off-white color? Thanks for any suggestions.
Bob Salomon - HP Marketing
3200K, 3400K? What lights?
Probably 3200K lights, regular household lights, 2 200 w floor lamps, 1 overhead light of about 160 watts and perhaps an additional tungsten floodlamp of about 150 watts.
Don't know how much it helps. Looks like something between a KB15 [80a?] and a KB20.
Photofloods are 3200K, a 100-watt household bulb is 2900K, the lower the wattage, the yellower its light. Mixing light sources is the surest way to get uncorrectable color effects. There is a Kodak publication, called "Kodak Filters", which covers the subject in great detail, and offers a chart to determine correction filters. The book is overkill for most photographers (it is for me) but that information alone is worth the price of admission. It's probably published by Silver Pixel Press.
Paul, for better results, use tungsten film. These filters are only a less-than-ideal solution. But anyhow, I would recommend the "Kodak Professional Photoguide", which contains a nice filter calculation dial for this (among others).
I've always used an 80A filter with household bulbs, usually 150W halogens, with excellent results. They tend to burn hotter than normal bulbs, which I think will still be slightly warm even with the 80A.
Undimmed Quartz Halogens are 3200K. the average standard household lights, undimmed, are about 2700K.
You will be better off using tungsten balanced films over daylight balanced films.
An 80A filter corrects more than an 80B, which in turn corrects more than an 80C filter, which corrects more strongly than an 80D. To be precise, an 80D raises the effective color temperature by 700K, an 80C raises effective color temperature by 1100K; and an 80A raises the effective color temperature by 2300K (3200K to 5500K -- which is nominal photographic "daylight".) By "effective color temperature" I mean as the film perceives it. The 80, 81, 82, and 85 series are camera filters. The equivalent lighting gels are the CTB series from Rosco and Lee
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