Warranty
Six months - used equipment that tests to specs
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The MF-23 Multi-Control Back is designed specifically for the Nikon F4 and F4s cameras. Data back imprints the year, month, day or frame number. Information can be imprinted between the frames leaving the image unaffected. Number imprinting range from -2 to 2000; the year programmed to the year 2100; and daily alarm. Manual ISO film speed setting range: 25-400. The back displays a low battery warning and requires two SR44 batteries.