The lens can be threaded or snapped onto the objective lens
ATN's 5X Mil-Spec Magnifier Lens is a high-performance Galilean a focal telescope that easily mounts to the objective lens of many night vision devices. The lens can be threaded or snapped onto the objective lens. Incorporates very fast optics (F/1.5) with field of view 7.5°. Includes: - Snap On Adapter - Convenient Flip Up Objective Lens Cover - Removable Rear Lens Cap - Carrying Case (Waterproof). Specifications: - Fits: ATN 6015, PVS14 Monoculars and PVS-7 Goggles