Telescopes may also be classified by location&colon; ground telescope, space telescope, or flying telescope. Cygni is a binary star visible in large binoculars or a small amateur telescope. Sighting is optical, and carried out through an M112/3 combined monocular telescope and binocular periscope. The cystoscope has lenses like a telescope or microscope. These represented the discoveries made possible by the telescope and the microscope. It had previously been used to calibrate instruments on board the Hubble Space Telescope. This telescope was the largest refracting telescope at that time. This limits Hubble's performance as an infrared telescope. Refractors were the earliest type of optical telescope. Like the Schiefspiegler, it is an unobstructed, tilted reflector telescope. This instrument had an altazimuth mount with a sighting telescope. Another instrument was the Bruce photographic telescope. III stars is a goal of NASA's James Webb Space Telescope. The Five-hundred-meter Aperture Spherical radio Telescope (FAST; ), nicknamed Tianyan (, lit. A relief panel depicts putti using instruments such as a telescope and prism.