The Pan AV is a durable, high quality sight engineered to give you the advantage of a red dot sight in a compact light-weight, water resistant and shockproof design, whether you use it for rapid fire shooting of moving targets, or normal shooting. The multi-reticle (4 patterned) optical glass lens is parallax corrected, and produces a clear, high resolution image. This 33mm (1.3 inch) in diameter lens allows unlimited eye relief and a wide field of view. The Pan AV is one of the smallest, lightest, most versatile sights of its kind.