Do you have a diagram that shows which contacts to mask off on the "K" and "M" lenses?You can check out this page and determine exactly which part of the lens mount (not camera mount) to mask (just use a ruler to measure the distance). You need to use a little imagination on how to do it. I myself use a hobby masking tape (which wouldn't peel itself off, unlike other masking tapes) from Testors. I just shape it to fit the lens mount (don't cut on the lens mount because the cutting blades will leave deep cutting marks). Also, you don't want something too thick which makes mounting the lens difficult.
http://www.bdimitrov.de/kmp/extras/K-mount/Ka.html
regards,
Alan Chan
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