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Hi Bojan,
Well done on a deluxe solution employing the threaded collar. If you're making collars there's probably only two thread pitches you need to worry about: 0.75mm and 1mm, with 0.75mm being almost universally used for most small to medium sized lens threads. I have one larger Nikon lens that has a 122mm filter thread diameter with a 1mm pitch. Mostly in larger lenses now days makers use clip in lens hoods, but I'd say that 0.75 and 1mm pitch threads would do for most lenses.
Best
JA
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