Sony E Mount Lenses For Sale
This lens fitting was launched with the original Sony NEX mirrorless camera in 2010. The lenses were described as E mount to distinguish them from the lenses for the Sony Alpha DSLRs which adopted the 'A mount' designation. The NEX used an APS-C sized sensor, slightly smaller than the full frame size of a 35mm SLR, and often referred to as a crop sensor. Because the sensor is smaller, then lenses can be smaller as well. A 50mm lens on a crop sensor camera produces the same image as a 75mm lens on a full-frame camera.
The full-frame mirrorless Alpha 7, was introduced three years later using the same lens mount but with a new range of lenses to cover the larger image area. An 'F' for full frame was added to the designation for these larger lenses.