The 60mm ARD (Anti-Reflection Device) is only compatible with
Leupold Gold Ring Spotting Scopes and
Leupold Mark 4 12-40x60mm Spotting Scopes. Leupold created these threaded anti-reflective devices (ARD) in nearly every objective lens size, each featuring scores of tiny, light-transmitting honeycomb baffles that reduce lens glare without obscuring your sight picture.