Feather Vision lens in housing, for Nomad 42mm and 35mm and 3DXL2 Scopes, from Shrewd. PLEASE NOTE: Both the 42mm and 35mm scope use the same size lens. There are no seperate models for the two scope sizes. Key features: Housing made of CNC machined aluminum Easy to clean, convex glass lens Screws into scope - get the same dot position every time, even if you remove your lens to clean it it will go back in the same rotation Anti-reflection and armour coatings are glare-free and scratch resistant Available in 2x to 8x magnification