<p>Meter sensitivity is not the only issue here. The OP has an F2, which used a CdS meter as I recall. These were very non-linear in the red spectrum. I first tried metering through filters for B&W with a Nikon FE, and found that I had to draw up a correction table for the different filters. The meter in the FE is different but similar vintage. The Wratten 29 (dark red) caused the meter to misread about 2 stops, if I remember correctly. Only the K2 had no correction due to the light spectrum. Everyone seems to agree that metering without a filter is recommended, but I have found that using an EI of 3 is the best starting point for this film. It will depend a lot on development, and of course the amount of IR that is actually present in the light because this can be highly variable with the time of day, season, atmospheric conditions, and even with latitude. I always bracket, at least three shots preferably plus/minus 1-1/2 stops.</p>