The clip-on Night Vision Sight CNVD-22 is a high performance system that mounts to any MIL-STD-1913 rail interface in front of day time scope. This gives the operator night vision capability from a standard day scope system. No matter what type of IIT installed, the fast F:1.15 catadioptric lens brings brighter and sharper image in moonlight, starlight, or even overcast nights. The unit is installed, operated, and removed without tools and without affecting boresight alignment. Unlike most of similar systems, the CNVD-22 has conveniently built-in collimator which allows to “fine tune”any smallest discrepancies or possible misalignment. The CNVD-22 can be mounted in front of a spotting scope for long range reconnaissance, hand held as a night observation device, or placed in front of a riflescope for sniper applications. The best viewing can be achieved with the day scopes having various power between 3-9X while other clip-on units on the market having severe image degradation after 4x. While mounted on the MIL-STD-1913 rail, the CNVD-22 can withhold mid to heavy recoil which allows to use it on variety of sniper or hunting guns.