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Forum: Film SLRs and Compact Film Cameras
12-21-2014, 11:32 AM
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Because the light meter is coupled to exposure settings including ASA, Shutter speed, and Aperture, there are several moveable contact points which provide variable resistance so the light meter is accurate for your various exposure settings. As these contacts corrode over time (every metal except gold will corrode), the resistance of the contact point increases. Also, contact points between dissimilar metals will develop high resistance over time (galvinic reaction). The higher current available from the larger battery will "burn" corrosion out of high-resistance contact points. We used a similar technique to clear high-resistance problems on telephone lines, back when telephones had lines.
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Forum: Lens Clubs
12-10-2014, 11:02 AM
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