Format
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Can mean either the size of the camera or the size of the film or sensor. For camera, sizes there are APS, 35mm, medium and large format. For film format there is APS, 35mm, 645, 6x6, 6x7, 6x9, 4x5, 5x7, 8x10, etc. In digital photography, DX, 35mm size, 645 and 6x6.
