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Author Message   Hderhut Tinkerer Username: Hderhut Post Number: 3 Registered: 09-2010 Rating: N/A Votes: 0 Posted on Monday, December 05, 2011 - 10:08 pm:    I picked up a piece of equipment and need help identifying it. It appears to be a viewfinder or range finder of some kind. It is about 5 inches long and has mounts for attaching to a camera accessary mount. It has these on two sides so you can orientate the viewer horizontal or vertical. There is no makers mark,just a serial number.The two levers on top marked 15 and 75 activate masks to reduce the viewing area. The knob up front adjusts focus and the smaller one on the back slides a metal piece up and down at the back. The hole in back has threads. A missing piece maybe? I have included some pictures. Any help will be much appreciated. David