Definition: A medium format camera is a type of camera that uses a larger image sensor or larger film than most DSLRs or point and shoot cameras.
Medium format cameras originated with film cameras, as they used larger film than 135mm film.
With digital cameras, medium format refers to a camera that uses an image sensor larger than that of a 35mm film frame. Sometimes, a medium format film camera can be fitted with a "digital camera back," which converts the film camera to a digital camera.

