Pentax UP 8-16x21mm Porro Prism Binoculars Black

The Pentax UP 8-16x21mm is a variable magnification binocular with a Porro prism design that delivers 8x to 16x magnification across a 21mm objective. Its uni-body construction locks the objective lens in a single housing while synchronizing eyepiece movement, which enhances durability. Apherical lens elements maintain edge-to-edge sharpness across the field of view, which ranges from 285 feet at 8x to 170 feet at 16x magnification (at 1000 yards). The binocular focuses from 10 feet to infinity using a center focus mechanism, with eye relief of 14mm at 8x and 11mm at 16x. A helicoid eyepiece ring allows precise focus adjustment. Overall dimensions are 4.37″ x 4.37″.