The Pulsar Digital Forward DFA75 Clip-On Night Vision Weapon Sight Scope attaches to your daylight riflescope for night vision shooting. With a CCD chip that is used in digital deep space astronomy, the Pulsar Forward DFA75 delivers ultra-sharp images in very challenging lighting conditions. The Forward DFA fits on to the front optical bell of a day telescopic sigh using a specially designed mounting assembly. These assemblies are available in various diameters and each has a set of reducing rings (the rings can be used as necessary depending on the diameter of the optical bell) for a precise fit. The adapter is permanently attached to the optical bell of a telescopic sight, enabling the Forward DFA attachment to be quickly installed when required. When the attachment is not used, the adapter accommodates a protective cap that covers the lens of an optical sight in the daytime.