There were instructions about how to modify a Pentax spotmeter in an old issue of Photo Technique. The idea was to set the long end of the meter's sensitivity to the long end of HIE, using a Melles Griot interference filter, then add whichever visibly opaque filter that you were going to use over the camera lens - all this happens right in front of the meter cell so you can still see through the meter. I modified a Pentax and a Sinar Booster that way. All my old copies of Photo Technique are in storage, so I can't look the article up. I still have some of the Melles Griot filter somewhere in a drawer - but it isn't correct for the IR films available now, of course. It was quite easy to cut down - just like very thin glass, protected with tissue paper when snapping along the scratch.
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