Dimensions 219 x 161 x 58 mm (8.6 x 6.3 x 2.3 inches) Weight 680 g (1.5 lbs) MTF / spatial resolution Exceeds 4.0 lp/mm @ > 60% contrast Pixel resolution 18.4 to 20 pixels/mm Iris image pixel resolution 640 x 480 pixels Image output Meets ISO 19794-6 Capture distance (to forehead) 0 to 10mm (0.0 to 0.4 inches) Optical path distance 350 to 380 mm Depth of field 30 mm (1.2 inches) Inter-pupillary distance covered 40 to 90mm (1.6 to 3.5 inches) Time of capture Around 1 second, typical, from time o