Visionking 6-25x56 Side Focus Riflescope Mil-Dot Hunting Tactical Rifle Scope Illuminated For .50.338.308 Cal Description: This Visionking 6-25x56 features 35mm body, 56mm Primary Objective, Side Focus,full multi- multicoated optics, locking windage and elevation turrets with 1/4” MOA clicks,optimizes the transmission of low-light wavelengths, so you see the details of low-light scenes in brighter detail than any other riflescope.It is 100% Waterproof and Fogproof.It suitable for the largest long-range weapons, including those chambered for the .308 .338 Lapua and .50 BMG.It is especially good on .50 BMG. Specification: Magnification: 6-25 Objective lens: 56mm Eyepiece diameter: 36.5mm Coating: FMC Green Field of View(ft@100yds): 5.8-1.5 Exit Pupil: 9.3-2.4mm Eye Relief : 90mm Tube diameter (mm) 35mm Finish: Matte black Waterproof: Yes Fogproof: Yes Shockproof: Yes Battery: CR2032 3V(No include) Nitrogen: Full filled Nitrogen Click Value: 1/4′ Parallax: +0.125SD ~ -0.125SD Side Focus: 10 yard ~infinity Reticle: Mil-dot Length (mm) 394mm