Pentax SMCP-D FA 50mm f/2.8 Lens for Pentax and Samsung Digital SLR Cameras (OLD MODEL) Lens Construction: 8 elements in 7 groups Angle Of View: 47 degrees (31.5o with *ist D body) Min Focus Distance: 7.67 inches (0.195m) Filter Diameter: 49mm Weight: 9.3 oz. (265g)