I'm a bit confused. Do you have a Pentax spot meter that has been modified by (the long-gone) Zone VI Studios? Those had filters added to more closely align the meter to the sensitivity of panchromatic film. In theory these mods let you "meter through the filter"; I used one for many years and it did work very well that way. Richard Ritter used to work for Zone VI, and as others have said, will be a fine choice to calibrate your meter, modified or not. www.lg4mat.net
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