I've seemed to have a bit of trouble recently using my filters for some landscapes. I like darkening the skies with my deep red filters, one is a B+W 52 091 8x MRC. I think that's brand,thread size, I don't know what 091 is...maybe the shade, 8x means three stops of light held back I think? And I think MRC is a coating. I also have a 67mm size of the same filter. As well, I have a Y2 (Yellow) #8 filter that says filter factor 2 or 1 stop.
I have an analog spotmeter and I'm not sure the best way to meter with these filters. I think I've been trying to meter with the filter in front of my spotmeter because I don't always feel that I get exactly 3 stops difference or 1.5 for the two yellow filters I have.
Should I just meter like normal and add a filter factor or does it work to meter through a filter?
I'm really asking this because I seem to have gotten some thin negatives/underexposed when I meter through the negatives. I usually get good negatives shooting my ilford fp4+ at box ISO of 125 and I didn't know if this means I should overexpose some more.
Thanks!
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