Designed specifically for muzzleloaders, the Omega line gives you Nikon quality for the black powder season. The Omega Muzzleloader scopes feature 5'' of constant eye relief. They also feature the Nikon BDC(Bullet Drop Compensating)250 reticle, engineered precisely for trajectories common to .50 caliber muzzleloaders using 150 grain charges and 250 grain bullets. Hand-turn 1/4-MOA adjustments give you precise correction. Multicoated lenses provide great light transmission for less than ideal situations. Waterproof, shockproof, and fogproof. Full lifetime warranty. The Nikon Omega Muzzleloading Scopes feature: Nikon BDC 250 reticle Multicoated lenses for superior light transmission WaterproofFogproofShockproof 1/4 MOA windage and elevation adjustment Constant 5'' of eye relief FOV = Field of view at 100 yards