I have a simple (or perhaps not so simple) question. I've purchased Heliopan Yellow #8, Orange #22, and Red #25 filters. According to the specs, Yellow has a compensation factor of 1.5 stops, Orange 2-stops and Red 3-stops. However, when I take a spot meter reading in EV mode with a Sekonic 758, the difference in readings between a straight reading and one through the filter is 0.6 stops for Yellow and 1.1 stops for Orange filter.
I want to trust my own readings, but I am confused by the difference. I have taken readings from different subjects ... sky, stuff around the house, ground, etc. and the difference in EV readings is never 1.5 stops for Yellow or 2 stops for Orange.
This has me puzzled. What am I not getting? What is the correct compensation factor to use?
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