The Vudu 3.5-18x provides a robust 34 mm tube XC High-Density glass and is loaded with other performance features required to take that precise long-range shot. The oversized and precision-machined turrets with EZ Chek zero stop feature let you quickly dial adjustments and return to zero even in low-light conditions. The side-mounted parallax adjustment allows you to dial the reticle focus in for the most difficult long-range shots. – Magnification: 3.5-18x – Objective Lens: 50mm – Focal Plane: First Focal Plane – Eye Relief: 3.5x: 91-101mm; 18x: 90-101mm – Exit Pupil: 3.5x: 11.2mm; 18x: 2.8mm – Field-Of-View (Degrees): 3.5x: 5.6 degrees; 18x: 1.1 degrees – Field-Of-View (@100 Yards): 3.5x: 29.5 ft; 18x: 5.7 ft – Exterior Finish: Flat Black; Type III anodized – Illumination Controls: Push Buttons – Exposed Optical Surface Treatment Lens Coating: Broadband anti-reflection coating – Windage and Elevation Increment Per Click: MD1 H59 Models: Approx. 0.1 MRAD – Total Elevation Adjustment Range About Factory-Defined Zero Reference: ± 14.5 min MRAD or ± 50 MOA – Total Windage Adjustment Range About Factory-Defined Zero Reference: ± 11.5 min MRAD or ± 40 MOA – Battery Type: CR2032 – Auto Power Shut-Off Typical Time Interval at Which Power Will Shut Down to Preserve Battery Life: Approx. 2 hrs – Battery Life Typical Time of Use at Middle Brightness Setting at Room Temperature: Approx. 500 hrs – Overall Length: 377 mm (14.84 in) – Weight: 33.6 oz (952 gr) – Tube Diameter: 34mm