APS-C refers to the size of an image sensor in digital cameras. This type of sensor is smaller than the so-called "full-frame" sensor, which corresponds to the size of a 35mm film frame, but at the same time, it is significantly larger than the sensors used in mobile phones and common compact cameras. Due to the smaller sensor size, a phenomenon called "crop factor" occurs. In practice, this means that a lens mounted on an APS-C camera captures a narrower field of view than it would on a full-frame camera. The resulting image thus appears magnified. This factor is most commonly 1.5× or 1.6×, so for example, a 50mm lens on an APS-C body behaves approximately like a 75mm lens on a full-frame body. Cameras and lenses designed for this format are often smaller, lighter, and more affordable than their full-frame equivalents.