24mm is also a nice focal length for a crop camera - this lens equates to a 36mm f/2 on a full frame camera. Actually a 24mm and a 50mm lens is a great APSC combination... I am tossed up between getting a 24mm and a 16mm f/1.4 Sigma. I have the 16mm f/2.8 Sony and the 19mm f/2.8 Sigma. I am not fond of either of these lenses and they will be going on eBay very soon.