Feather Vision Verde Vitri lens utilizes glass supplied by Zeiss with a Zeiss anti-reflective coating. The coating on the lens is exceptionally durable, easy to clean, hydrophobic, oleo phobic, anti-static, and has a light transmission of 99.98%. Lens is encapsulated in a CNC machined retainer housing and ring for a repetitive focal point. Screws directly into Shrewd scope housing using a single, continuous thread to ensure a consistent and repeatable lens placement every time. Fits Shrewd Nomad 42mm scope, Shrewd Nomad 35mm scope and the Shrewd 3DXL2.