The new OPTIX series offers fully multi-coated lenses, one-piece aluminum tube construction, low profile zero-reset turrets, fast focus, two-piece weaver rings, as well as BSA's new BDC-8 reticle. The 4.5-18X model offers an adjustable objective and illuminated reticle, in addition to the above features.Features :MAGNIFICATION LOW: 3XMAGNIFICATION HIGH: 9XOBJECTIVE LENS DIA. (MM): 40ADJUSTMENT GRADUATION (MOA): 1/4LENS COATING: Fully Multi CoatedW/E ADJUSTMENT RANGE: 35EYE RELIEF (INCHES): 3.7 - 4FOV LOW @ 100' (FT): 31.9FOV HIGH @ 100' (FT): 10.6