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Author Message   David_ritchie Tinkerer Username: David_ritchie Post Number: 30 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Sunday, February 17, 2008 - 03:21 pm:    Thanks again Rick. Re the batteries, I have seen graphs which show that the silver oxide batteries show a very flat voltage until they are almost exhausted whereas the ZA batteries begin to drop slowly from the beginning and faster as time goes on.With negative film it would not matter too much, but I still shoot a lot of slides. Again, Thanks