Made by Cambridge Instruments this is a 1.25x S.W.D. Zoom 500 Trinocular Microscope objective. The front lens clear diameter is 32mm and the rear lens clear diameter is 21mm. None of the optics are coated. This item is 85mm long by 74mm wide. The base that fits against the microscope body is 74mm long by 56mm wide. The rear lens housing which goes into the microscope body is 32.5mm in diameter with two pins sticking out the sides for clasping in place.
