The lens of the daytime scope must be positioned at least 15 mm behind the front edge of the scope body. This excludes mechanical contact of the NVS-33 night sight attachment and daytime scope objective lens.

Last digits in the NC540 adapters part numbers correlate with the diameter of the daytime riflescope. For example, to use NVS33 with Swarovski Z6i 2-12x50 scope, you should take the adapter NC540.50.

During shooting with the night vision riflescope attachment NVS-33, which is attached to the daytime riflescope with help of the adapter the adapter ring could move along the objective lens of the daytime riflescope.

The size of this movement depends on the tightening force of the adapter screw (5), recoil force of weapon, etc., and could be equal to 1 mm on each shot. This movement is allowed and do not affect on the impact point. However, the position of the adapter should be controlled after each shot in the shooting process.

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Newcon Optik NVS-33 operation manual