The compact and lightweight black 8-16x21 U-Series UP Binocular combines aspherical optical elements and BAK4 Porro prisms to deliver edge-to-edge image sharpness with a wide angle of view. The optical elements are also fully multicoated to provide a high transmission of light. With an 8-16x range of magnification and 21mm objectives, you obtain a wide zooming range and a compact form factor. You can easily spot your targets with a 5 angular field of view at 8x magnification and quickly zoom in on them with the optical zoom. To reduce image jitter at high zoom factors or for prolonged observations, you can connect the binocular to a tripod via an integrated 1/4"-20 socket. In addition to observing distant scenes, birds and game, the minimum focus of 9.9' allows you to study in detail close objects like animal footprints, marks or landscape features. The binocular also features a 2.6-1.3mm exit pupil range, a 14-11 mm eye relief range, an interpupillary and a diopter adjustments.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 sliding rubber eyecups. Also included are a carrying case, a neck strap, and eyepiece covers.Optical Performance- Optical zoom range: 8-16x- BAK4 Porro prisms- Aspherical optical elements of/er edge-to-edge image sharpness- Fully multi coated optics- Angular field of view range: 5-3- Interpupillary adjustment- Diopter adjustmentConstruction 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- Sliding rubber eyecups- 1/4"-20 tripod socketSpecifications:- Prism Type: Porro- Magnification: 8-16x- Objective Lens Diameter: 21 mm- Angle of View: 8x: 5 (actual), 16x: 3 (actual)- Field of View: 16x: 157.5' @ 1000 yd / 52.5 m @ 1000 m- Minimum Focus Distance: 63.8' / 19.4 m- Exit Pupil Diameter: 8x: 2.6 mm, 16x: 1.3 mm- Eye Relief: 8x: 14 mm, 16x: 11 mm- Interpupillary Adjustment: Not Specified by Manufacturer- Dioptric Correction: Not Specified by Manufacturer- Focus Type: Center- Tripod Mount: Yes- Dimensions: 4.4 x 4.4 x 2.1 Inch / 11.1 x 11.1 x 5.3 cm- Weight: 10.9 oz / 309 gIn the Box:- Pentax 8-16x21 U-Series UP Binocular- 2 x Eyepiece Covers- Neck Strap- Carry Case