What is the advantage of a removable camera back?
Certain EOS film cameras, mainly the high-end pro models, have interchangeable backs. This feature lets you remove the camera back which shipped with the camera and install a different back instead. For example, you could swap your regular camera back out for one with more sophisticated timer functions, such as the Command Back E1 for EOS 1 and 1N cameras. Or you could add a Quartz Date Back E to an EOS 630 to get date printing. Professional photographers sometimes install Polaroid film backs so that they can get instant previews of complex lighting situations. None of Canon s current low or mid-range film cameras support interchangeable camera backs. None of the digital cameras have interchangeable backs for obvious reasons and neither are their electronics upgradeable.
