[QUOTE=AdamD;1536158]Sometimes we may overthink things too much.
A yellow/orange filter will introduce 1.5 to 2 stops loss, a red typically 3 stops, but in the end the manufacturer tells us that or we can find it ourselves with a meter.
Now, it is also a tuned color filter and as such it will change the transmission depending on the wavelength. If I have a red rose and use a red filter, I will lose ~3 stops, the rose will appear basically white, and any greens will get darker. With a green filter maybe I lose ~1 stop and the rose will appear dark and the leaves fairly light.
You can’t make a general rule because it depends on what your camera is looking at. Even the same red filter may give you a different effect for the sky at a different time of the day!
So I’d suggest to just account for the nominal filter loss and consider that generally you will darken/lighten according to what you have in front of you based on general rules.
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