Product Features 25-YARD SIDE FOCUS PROFESSIONAL-GRADE OPTICAL SYSTEM M1C3 ADJUSTMENTS FIRST FOCAL PLANE ZEROLOCK WINDAGE DIAL CUSTOM DIAL COMPATIBLE WATERPROOF, FOGPROOF, & SHOCKPROOF 4:1 ZOOM RATIO Product Specifications Adjustable Parallax : Side Focus Magnification: 4.5-18X Objective Lens Diameter: 52 mm Reticle: FFP PR2-MOA Finish: Matte Black Field Of View: 5.2-23.1 Ft @ 100 Yds Adjustment Size: .25 Moa Focal Plane: First Objective: 40Mm Eye Relief: 3.6-3.9" Weight: 27.5 Oz Windage Adjustment Type: Zero-Lock Windage Length: 14.6" Maintube Diameter: 34 mm