Originally Posted by
Sevo
None that I know of - the process itself probably is too trivial, and the more complex calibration issues are exactly the same as for meters without filter modification.
Given the low IR sensitivity and limited spectral range of the remaining IR films, attaching a deep red or IR filter to a unmodified meter might already be good enough. For EIR or HIE you had to remove the (IR cut-off) blue filter from meters with silicone blue cells (and ideally substitute it with a deeper IR filter), and then could meter through the same filter you'd use for exposure. Mind, these films had a wide IR response and good visible/IR relation. With all current films it never is a 1:1 process, you still have to compensate considerably to match film to meter readings, as their IR sensitivity is odd, short-range, wobbly and disproportionally lower than the visible one - hence it might even be advisable to leave the blue filter on.
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