- The super-short Vudu 3-9x32 might be the perfect optic. Built from aircraft-grade aluminum, it's lightweight, durable, and just 6.8" long. This second-focal-plane scope is fog-, water-, and shock-resistant, with capped turrets and a rotary dial for 10 brightness levels. Powered by a CR2032 battery for up to 300 hours, it features an integrated base compatible with mini-ACOG mounts.