Full-frame describes a digital camera sensor that is the same size as a frame of 35mm film, about 36 x 24mm. Full-frame sensors are used in many DSLR and mirrorless cameras.
A full-frame sensor has a crop factor of 1, so a lens gives the same field of view as it did on a 35mm film camera. Compared with smaller sensors, full-frame sensors usually give better low-light performance and allow shallower depth of field.
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