Ever since cameras started to sport built-in light meters, batteries have become necessary in order to make them portable. Indeed a camera can be operated completely mechanically, no need for batteries. Older cameras had a manual or mechanical setting that required no batteries for operation. You had no light meter to guide you but at least you could get the shot when your batteries were depleted. The film would be advanced and the shutter cocked manually by cranking a lever usually positioned above the right hand thumb.
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