The binocular is very compact, lightweight, and features a single piece frame that houses objectives, which allows for a synchronised interpupillary adjustment. To accommodate eye glasses wearers, the binocular of/ers twist-up rubber eyecups. Also included are a carrying case, a neck strap, and eyepiece covers. Optical Performance - BAK4 Porro prisms - Aspherical optical elements of/er edge-to-edge image sharpness - Fully multi coated optics - Minimum focus of 20 Inches - Interpupillary adjustment - Diopter adjustment Construction Details - Single piece objectives' frame allows for a synchronised interpupillary adjustment - Contoured body provides a comfortable grip - Centre focus knob of/ers an easy focusing - Twist-up rubber eyecups - Integrated 1/4"-20 tripod socket Specifications: - Prism Type: Porro - Magnification: 6.5x / 8.5x - Objective Lens Diameter: 21 mm - Angle of View: 7.5 (actual) / 6 (actual) - Field of View: 393.7' @ 1000 yd / 131.2 m @ 1000 m (6.5x21) 315.0' @ 1000 yd / 105.0 m @ 1000 m (8.5x21) - Minimum Focus Distance: 10.4' / 3.2 m - Exit Pupil Diameter: 3.2 mm (6.5x21), 2.5 mm (8.5x21) - Eye Relief: 15 mm - Interpupillary Adjustment: Not Specified by Manufacturer - Dioptric Correction: Not Specified by Manufacturer - Focus Type: Center - Tripod Mount: Yes - Dimensions: 4.5 x 4.4 x 2.1 Inches / 11.4 x 11.2 x 5.3 cm (6.5x21) 4.6 x 4.3 x 2.1 Inches / 11.6 x 11.0 x 5.3 cm (8.5x21) - Weight: 10.2 oz / 289.2 g In the Box: - Pentax 6.5x / 8.5x 21 U-Series Papilio II Binocular - Eyepiece Covers - Neck Strap - Carrying Case