We often refer to 50mm lens on a full frame as a "standard" lens because 50mm is fairly close to the perspective of the human eye. Using a 50mm lens on a camera with an APS-C sized sensor changes that perspective by about 1.
5x making your effective focal length closer to what you get with a 75mm lens on a full frame body. Now, that's not a bad thing at all and if you love shooting portraits it's a very good thing! A 50mm lens on a camera with an APS-C sized sensor is a killer portrait lens. Also, because longer focal lengths compress perspective you'll get more of a three-dimensional look when making full body portraits if you shoot at your brightest aperture. . thephoblographer.com
2018-7-31 13:00