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How about a Digital Film Roll cartridge for a standard manual SLR Camera that can replace your conventional 35mm film roll... The digital cartridge could have parts which would fool the manual SLR to believe that the roll is real... i.e., wind the roll in place after every exposure, unwind etc. The cartridge would consist of a battery unit, storage space, exposure transfer screen/pad, roll advance sensor. The battery and storage is shaped like a standard film roll atttached to a screen, which registers the exposure through manual/normal operation of the camera, and the forward movement sensor fools the camera that the picture has been taken. The battery and storage unit would have necessary sockets for transferring photographs to the computer. Such an equipment could save development and processing cost of photographs.