The angle that the lens sees depends on the size of the sensor in the camera. A 50mm lens on a traditional film camera is the equivalent of a 75mm on a DX size sensor, which is what you will find on the majority of digital SLRs like the Canon Rebel or the Nikon D60. In order to have a lens equal to the same angle of view as it would on a film SLR one needs a camera with a FX or full size sensor. FX cameras cost more but are much much better in lower light situations regarding noise (color artifacts in dark areas.)
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