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Advanced Photo System type-C -LRB- APS-C -RRB- is an image sensor format approximately equivalent in size to the Advanced Photo System `` classic '' negatives of 25.1 × 16.7 mm , an aspect ratio of 3 :2 .. image sensor format. image sensor format. Advanced Photo System. Advanced Photo System. Sensors approximating these dimensions are used in many digital single-lens reflex cameras -LRB- DSLRs -RRB- , Mirrorless interchangeable-lens cameras -LRB- MILCs -RRB- , and a few large-sensor live-preview digital cameras .. APS-C size sensors are also used in a few digital rangefinders .. rangefinders. rangefinder camera. Such sensors exist in many different variants depending on the manufacturer and camera model .. All APS-C variants are considerably smaller than 35 mm standard film which measures 36 × 24 mm .. Because of this , devices with APS-C sensors are known as `` cropped frame '' , especially when used in connection with lens mounts that are also used with sensors the size of 35 mm film  : only part of the image produced by the lens is captured by the APS-C size sensor .. Sensor sizes range from 20.7 × 13.8 mm to 28.7 × 19.1 mm , but are typically about 22.5 × 15 mm for Canon and 24 × 16 mm for other manufacturers .. Canon. Canon Inc.. Each variant results in a slightly different angle of view from lenses at the same focal length and overall a much narrower angle of view compared to 35 mm film .. angle of view. angle of view. This is why each manufacturer offers a range of lenses designed for its format .