As with other UCF models the 8-16x21 UCF Zoom II has an innovative dual-axis eye-distance adjustment system high-refraction BaK4 glass prisms multi-coated optical elements and aspherical lens elements incorporated into the eyepiece optics.
This portable compact user-friendly binocular is perfect for the viewer on the go - whether it be bird watching sporting events wildlife or indoor performance viewing.FeaturesMagnification power ranges from 8 to 16x21.Aspheric lens elements enhance edge-to-edge sharpness.In-line control system positions zooming focusing and diopter adjustment together.High-refraction BaK4 glass prisms for brighter clearer image.Pop-out right diopter adjustment knob. Specifications
Binocular Type: Porro prism, Linked-dual-axis, Center focusing, Center zoom ring, Center diopter adjustment knob Lens Construction: Objective Lens Coating: Lens Magnification: 8 to 16X Objective Lens Diameter: 21mm Real Field Of View: 5.0 degrees (8X) to 3.0 degrees (16X) Apparent Field Of View: 40 degrees (8X) to 48 degrees (16X) Field Of View At 1000 Meters: 87m (8X) to 52m (16X) Field Of View At 1000 Yards: 261 ft. (8X) to 156 ft. (16X) Exit Pupil: 2.6mm (8X) to 1.3mm (16X) Eye Relief: 14mm (8X) to 11mm (16X) Prism: Porro Relative Brightness: 6.7 (8X) to 1.7 (16X) Diopter Adjustment Range: +/- 4 m -1 (8X) Diopter Adjustment: Center knob (pop up) Eye Width Adjustment Range: 56 to 73.5mm Focusing Range: 3m to infinity Eyepiece Ring: Helicoid type Body Color: Black Height Width: 55mm x 111mm Thickness: 111mm Weight: 280g
Pentax 8-16X21 UCF ZOOM II Binoculars Carrying Case Strap Lens Caps Instruction Manual