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Author Message   Kiron Kid Rating: N/A Votes: 0 Posted on Thursday, October 28, 2004 - 07:39 pm:    The hearing aid, zinc-air cells work fine, and are about $1.00 per battery. The "Wein" zinc-air cells last considerably longer, but cost a few dollars more. If you use a Silver Oxide 1.5v cell, you can cut the film speed in half (½), and that will give you accurate meter readings and exposures. Kiron Kid