The Sightron S3 Long Range Rifle Scope features a 30mm tube for added strength and better light transmission. Each Sightron S3 is nitrogen filled to prevent fogging and is also water, fog and shockproof. Other features include easy to adjust target style turrets. - Magnification: 6-24x - Object Diameter: 50 - Eye Relief: 3.6-3.8 - Reticle Type: Mil-Dot - Click Value: 1/4 MOA - Fov: 16.1-3.9 - Length: 14.96 - Tube Diameter: 30mm - Windage Elevation Travel: 100 - Weight: 21.9 - Finish: Matte Black - Minutes Per Revolution: 15 - Target Knobs: Yes - Sunshade Included: Yes - Adjustable Objective: Side Focus (50yds to infinity) - Fully Multi Coated: Yes (Zact-7 TM 7-Layer)