Re: Color balance of film (TECH3D digest 18)

[T3D Bob Howard <bobh@xxxxxxxxxxxxx>]

RE: Steve Spicer asks if a film could be made for 3000K light so 
subject that was OK in daylight 5600K would look good?
I guess the modern world has been on electronic flash (=daylight) so 
long that people don't know that films and source were matched for 
many years. In color films there were Type A, Type B and Daylight.
These were matched as follows: Type A=3400K for photofloods (short 
life amateur lamps 1-4 hours max. life) Type B 3200K lamps, so called 
studio lamps about 50 hours life. Projection lamps in this class too.
Modern quartz halogen photo lamps are 3200K or a little higher 3300K.
Daylight film was balanced to 5600K. Shade illuminated from the sky 
is higher so "skylight" pink filter used in shade to bring 8000K down 
to 5600K.
It is possible when you said 3000K you were thinking of candids in 
normal home tungsten lighting (2700K). 3200K is just a bit yellow but 
this we accept as 'natural tungsten'.
FLASH!!  Reading the specs on the new CANON APS IX camera guess what?
Not only does it focus, judge exposure, but the sensor determines if 
lighting is daylight, flourescent or tungsten and codes the film for 
the printer to correct so it looks normal...WOW! BobH


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