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Author Message   Keith Roberts Rating: N/A Votes: 0 Posted on Sunday, August 08, 2004 - 03:14 am:    i have just acquired this lens with a Practica MTL3. It is an M42 automatic lens, with a switch for manual and auto operation on the barrel. No electrical terminals. Unfortunately it wont stop down in either mode. I am a novice at tackling my own camera repairs and would appreciate any advice on the best approach, or pointers to appropriate links.