Nikon 50mm f/1.8 AF Nikkor Lens for Nikon Digital SLR Cameras Type: Prime Aperture (max/min):	f/1.8 - f/22 Construction: 5 groups / 6 elements # Diaphragm blades:	7 (straight) Close focus distance:	0.45m Max. magnification:	1/6.6 Weight: 155 g.