Wide-angle lenses are the ones with focal length shorter than longest edge of imaging surface (36mm on 35mm full frame, about 24mm on APS-C).
For further discussion on wide and ultra-wide angle lenses, see the question What is an ultra-wide lens?
Wide-angle lenses are the ones with focal length shorter than longest edge of imaging surface (36mm on 35mm full frame, about 24mm on APS-C).
For further discussion on wide and ultra-wide angle lenses, see the question What is an ultra-wide lens?