The photocell was replaced such that the photo-response was a known. I doubt Pentax, Soligar, and others would all be the same photocell nor would they supply the info about their cells needed to design a filter. Also, photocells are available with a built in IR cutoff filter. This would solve part of the puzzle.
my picture blog
ejwoodbury.blogspot.com
You have to admit, it is pretty amazing how much interest this product generates so long after its introduction.
And additionally generates such interest considering that so many question whether the modifications do in fact and practice actually add useful information over conventional light meters (c.f. Butzi and others). Fascinating, in a way, and endlessly fun to read as the controversey comes around yet once more, as it inevitably does and will again.
Larry
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