FeaturesD-type lens design provides distance information as part of flash and ambient light exposure processes Classic normal lens provides speed and compact design Multi-layer coating minimizes flare and ghosting 52mm filter size Exceptionally lightweight and compact. Ideal for travel photography Stops down to f/22 for excellent depth-of-field control Specifications Focal Length: 50mm Maximum Aperture: F/1.8 Lens Construction: 6 Elements in 5 groups Minimum Focus Distance: Approx. 1.5 feet Maximum Reproduction Ratio: 0.15 Number of Diaphragm Blades: 7 blades Picture Angle: 46 degrees (35mm format), 31 degrees 30 minutes (Nikon DX format) Aperture: F/1.8-22 Filter Attachment Size: 52mm Hood: HR-2 Rubber hood Included Accessories: 52mm Lens cap, Rear cap Dimensions: 2.5 x 1.5 in. Weight: Approx. 5.5 ounces