Schmidt camera Schmidt camera A Schmidt camera, also referred to as the Schmidt telescope, is a catadioptric astrophotographic telescope designed to provide wide fields of view with limited aberrations. The design was invented by Bernhard Schmidt in 1930. Some notable examples are the Samuel Oschin telescope (formerly Palomar Schmidt), the UK Schmidt Telescope and the ESO Schmidt; these provided the major source of all-sky photographic imaging from 1950 until 2000, when electronic detectors took over. A recent example is the Kepler spacecraft exoplanet finder. Other related designs are the Wright Camera and Lurie–Houghton telescope. The Schmidt camera was invented by German-Estonian optician
Restoration of Gregorian chants can find as well a downloadable file of Chis Hakkennes' Graduale Lagal for the Graduale Novum, see: http://www.conbrio.de/musikbuch/graduale/graduale.php Restoration of Gregorian chants Restoration of Gregorian chants is the process of restoring the original melody in Gregorian Chant manuscripts. All mainstream editions of chant books (Vatican, Solesmes, etc.) are known to contain a large number of errors. Comparative studies have been undertaken in which related groups of the earlier rhythmic unheightened neumatic manuscripts are set in large tables of comparison which is juxtaposed with a similar table of later melodic linear notations. Research by Dom. Jean Claire in the field of