Ideal for long range observation. The AGM Afocal lenses incorporate very fast optics and perfect field of view. To mount the afocal lens to the device, screw it into the threading of the standard 1X objective lens. High-performance Afocal lenses quickly convert the night vision monoculars or goggles into a long-range night vision devices. Afocal lens by AGM is simple and quick to install in front of existing front lens of night vision device for instant visual enhancement.