I?f you need something compact yet powerful, the ATACR 4-16x42 F1 delivers. The fully multi-coated ED glass lenses within are stunning. Adjustments are standard with the Nightforce low profile ZeroHold feature, and available in .1 Mrad increments (12 Mils per revolution). A capped windage adjustment helps prevent accidental adjustment in the field. The parallax adjustment is marked with approximate numbered distances. The eyepiece features enhanced engraving, an integrated Power Throw Lever (PTL) and an XtremeSpeed thread for making a fast diopter adjustment. All of these features are paired with intelligent, Nightforce F1, first focal plane, reticles that provide for fast hold-off adjust Mfg: Nightforce SPECS: Objective Outer Diameter: 50mm, Exit Pupil Diameter: 4x:10.3mm, Field of View @100 yards: 4x: 26.9ft, Eye Relief: 85-90mm/3.35-3.54 in, Click Value: .250 MOA, Parallax Adjustment: 45 yds -Tube Diameter: 34mm/1.34in in, Eyepiece Outer Diameter: 45 mm, Overall Length (inches/mm): 12.6in/320