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Author Message   Leesobing Tinkerer Username: Leesobing Post Number: 23 Registered: 01-2008 Rating: N/A Votes: 0 Posted on Sunday, March 29, 2009 - 06:06 am:    it may be L39 before M3 you can using adpotping ring to M42 and adpotping other mount. PRAKTICA in before WW2 have produce some screw mount but 40mm.after WW2 contax s and it changM42 mount.