Color Balance (2 replies and 1 comment)
I have an idea for a shoot where I mix interior tungsten-balanced light with exterior light on an overcast day. The subject is outside and I want to manage the light ratio between the sky light and the tungsten light while maintaining some flexibility in when I can shoot. Ideally I would wait until the evening when it is still overcast and time it right, but if I wanted to reduce the power of JUST the overcast sky light, I thought about using an 85B warming filter with a tungsten balanced stock/digital color balance.
My questions are:
Is there a better way to manage the lighting ratios using just the camera (i.e. no additional lights)?
How much of the blue light does an 85B absorb?
Credit where it is due: https://youtu.be/M0Ptb1A3n8s»?
The camera filter cannot alter a color temperature difference between daylight and tungsten, the ratio of warm-to-cold will always be there -- all the camera filter can do is shift the overall color temperature one direction or the other. If you use an 85B filter on tungsten-balanced stock, the tungsten lamps will get very orange and the overcast daylight will be almost neutral. If that's the look you want, then that's fine. My tendency would be to not use the correction filter because one can color-correct the daylight from blue to neutral and the tungsten-lit areas can tend to be darker than the daylight areas, so if you filter everything warmer, the shadows in the tungsten section will go quite reddish (unless the overcast daylight is filling in the shadows in the tungsten-lit room.). But if a very warm look overall is your goal, then perhaps the 85B filter is the right approach.
The paler-orange 81EF is sometimes used instead of an 85B when you want to only correct halfway. Or the Tiffen LLD filter, which barely takes out some excess blue plus corrects out some UV haze.
You could also just add 1/2CTB to your tungsten light, reducing the difference between the two light sources, and then adjust the overall color in post.