I'm slowly collecting b&w filters. Right now I have the basic stuff sorted with a dark green, orange, yellow-green and 2 kinds of yellow. But those filter factors keep me mystified. Added to the problem is that they came without notice and the markings don't correspond with what I find on the net when I google.
So I tought I could perhaps measure them with a light meter. Woudl this be a good enough procedure:
- I wait for a day with nice even sunshine
- I put my Sekonic in incident mode and make a kind of tube in black paper with just the bulb poking in
- I measure the light as it is
- put on the filter and take another reading
- difference is the filter factor
Would this be a way to work and give usable results?
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