The type of sensor format in your camera body is a major consideration in your choice of lens as the angle of view that is recorded on the sensor will vary depending on whether your camera is a DX or FX format. FX format sensors produce an angle of view almost identical to the 35mm film format. DX lenses provide an angle of view close to a 35mm film format lens with a focal length 1.5Xs greater, so a 50mm lens on an DX format sensor DSLR will give the equivalent angle of view to a 75mm lens on a 35mm film format body (50mm x 1.5 = 75mm). Use the Nikon Lens Simulator to see how a photo is affected by camera model and lens selection:
http://www.nikonusa.com/Nikon-Produ...