Created by one of the best optical glass manufacturers in the world, the Nikon Prostaff Rimfire II 4-12X40 BDC 150 Riflescope was designed especially for the .22 long rifle caliber. Nikon uses a “Glass First Principle” – choosing a specific type of glass and selection of multi-coatings for each optic they create to maximize performance and provide superior image quality. A 40mm ocular lens diameter and 4-12x magnification range makes this scope a versatile choice for long-range shooting.