Archived posting to the Leica Users Group, 1999/07/15
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]>The filters are usually, as I recall, 80a the corrects regular 3200 K >tungsten to 3400K for tungsten film, 80b for using using daylight with >3400-3600K photoflood, then a deeper 80c and 80d. Er, no, I think that your memory has slipped a little. The 80C and 80D are paler blue than the 80A and 80B. The 80A is the bluest of the bunch and will correct 3200 K (ie pro tungsten, or P2 lamps, the temperature of B type film) to 5500 K. The 80B will correct 3400 K (ie amateur P1 photoflood lamps, the temperature of A type film) to 5500 K. 80C corrects 3800 K to 5500 K. 80D corrects 4200 K to 5500 K. The bluest filter in the B+W line is the KB20 which corrects 2800 K (ie household tungsten) to 5500 K. As I mentioned in an earlier post, anything helps - so when shooting neg film I always use the nearest filter I can get away with in the light. Good to hear Mark recommending the same. When shooting slides I prefer to use the correct filter - which is why I have a KB20 for household lighting. Thanks go to Don Post for speaking up in favour of correct filtration at the shooting stage when using neg. I'm surprised that no-one has flamed me for mentioning tungsten movie film. Regards, Malcolm