Leapers Magnifier features broadband multi-coated lens to provide crystal clear images. The innovative flip-to-side mechanism is for quick transition between 1X and 3X imaging. Feature: Broadband multi-coated lens to provide crystal clear 3x image Wide field of view - 30% bigger than comparable models from other brands Windage/elevation adjustability for optimum view centering Innovative flip-to-side mechanism for quick transition between 1x and 3x image Adjustable eyepiece for easy dioptric correction Precision machining and anodizing for maximum strength and wear resistance Patented quick-detach lever lock mounting base 42mm center height for most common dot sight combination Completely sealed and nitrogen filled for fog/weatherproof