Don't do it! A 760 nm filter on the Rollei stuff needs about 12 or 13 stops additional exposure. Bigger numbers are farther into IR, the film sensitivity is already rolling off at 720 and drops like a rock beyond that. And to your question about my statement above, guess I would have been clearer had I said increase exposure by 6 stops. You could set your meter to a lower ISO. I was using a Digisix that only goes down to 6 -- and if I used the 760 filter, I need about 0.25!
Originally Posted by StoneNYC