Not all pan films have the same kind of "pan" sensitivity, so filter factors aren't set in stone. If it's something I need a calculator or tablet for, it's getting too complicated for spontaneity in the field. At long exposures, the game changes in any number of ways. Save your smart phone for what it does best - skipping on a pond just like any other nice flat piece of detritus. The most I've ever needed was to simply write the filter
factor (or in my case, EV factor) on the filter box. ... don't even look at that anymore. Easy enough to remember.
Not all pan films have the same kind of "pan" sensitivity, so filter factors aren't set in stone.
And if you adjust the time to compensate for the filter, don't forget reciprocity after accounting for the filter factor.
But once you Add time to correct for reciprocity by adding time instead of aperture, you have longer time so the reciprocity isn't right again. I could never get a straight answer to this.
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