His instrument is a Celestron NexStar, a Schmidt-Cassegrain reflector with a 150-mm aperture, has a motorized altitude-azimuth mount. The handheld remote had enough room for him to add the Zero ...

The antenna has a Cassegrain reflector system for a frequency range of 18–31 gigahertz. To function optimally at these frequencies, the surface of the 13-metre main reflector must be so finely crafted ...

The 24-inch Boller & Chivens f/8 Cassegrain was installed in the dome of Sommers-Bausch Observatory in 1973 ... historical left-overs from the transition between the long-and-narrow refractor and its ...