Used night vision scope. Works great. Big and heavy.

Description This is a Vietnam era Crew Served Weapon Night Vision Device. It uses a Schmidt-Cassegrain optical system. The manual says 7 power. The objective diameter is probably 5.5 to 6 inches.

Image Intensifier Marked: Image Intensifier, Type: MX-7854/UV, FSN 5855-051-2702, U.S. Property, Ser. No. 17452, 8524 2.74" diameter x 7.3" long. 34mm flat exit diameter. 1.4" dia. flat fiber optic plate. Oscillator Marked: Oscillator H.V., M?052374B(F10), Lectrospace Co., Westbury, N.Y., Contract No., DAARC7-69-C-032, Ser. No., 3922 The oscillator has a socket on it's bottom that plugs directly into a pin on the image intensifier. Focus Turning the Focus knob clockwise moves the main mirror back Lens Cap - Filter The front cover contains a small open segment and a filter wheel with 3 neutral density filters, each more dense than the prior one as well as an open window. This would allow testing the scope in the daytime. Using the darkest filter on a cloudy day is about the same as no cover at night with 1/2 moon on distant hills. Reticule This sight is intended for use on either the M2 .50 cal. Machine Gun (M2 rtucule) or the 106 mm Recoilless Rifle (M40 reticule). This on is setup with the M2 reticule and straight through eyepiece. When the M40 reticule is used the right angle eyepiece is used. The reticule gets it's electricity from a cble that goes into the front of the front lens element. This is not a high voltage wire. Operation The switch with the pointer has 3 positions. CCW is OFF, then scope ON, then Scope and Reticule ON. The large knob controls objective focus and the eyepiece controls focusing on the image intensifier tube output window. When looking up at the stars at night there's a much larger number of start visible than with the naked eye. Also there is no night adaptation of the eye needed since the scope has a bright output. But you probably can see fainter stars with night adapted eyes. The output color is green to match the peak in a human eye's spectral response.

This scope was not intended to be hand held, and doing so is very difficult. Need to figure out a way to get it mounted on a tripod.