The Samuel Oschin telescope is a 48-inch (1.22m) Schmidt camera at the Palomar Observatory in northern San Diego County, California. The instrument is strictly a camera; there is no provision for an eyepiece to look through it. It originally used large glass photographic plates. Since the focal plane is curved these plates had to be preformed in a special jig before being loaded into the camera. The camera has been converted to use a CCD imager. This is a mosaic of 112 CCDs covering the whole (4 degree by 4 degree) field of view of the camera, the largest CCD mosaic used in an astronomical camera at this time. Ritchey 24 reflecting telescope A reflecting telescope (reflector) is an optical telescope which uses mirrors, rather than lenses, to reflect light. ... Palomar Observatory is a privately-owned observatory located in San Diego County, California, 90 miles (145 km) southeast of Mount Wilson Observatory, on Palomar Mountain. ... San Diego County is a county located on the Pacific Ocean in the far southwest of California, along the border with Mexico. ... State nickname: The Golden State Other U.S. States Capital Sacramento Largest city Los Angeles Governor Arnold Schwarzenegger Official languages English Area 410,000 km² (3rd)  - Land 404,298 km²  - Water 20,047 km² (4. ... A charge-coupled device (CCD) is a sensor for recording images, consisting of an integrated circuit containing an array of linked, or coupled, capacitors. ...