Zeiss Ikon S 310/S 312: With Time Running Out, Zeiss Ikon Offered These Cameras - Camera Talk
These compact 35mm cameras used four button-cell batteries, but it's easy to convert them to use a single modern-day lithium cell. Find out why these cameras are still relevant. That includes a companion Voigtlander model.
The battery conversion section starts at about the 6:30 mark.
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