Schmidt camera optical axis of the Schmidt design creates a Schmidt-Newtonian telescope. The addition of a convex secondary mirror to the Schmidt design directing light through a hole in the primary mirror creates a Schmidt-Cassegrain telescope. The last two designs are popular with telescope manufacturers because they are compact and use simple spherical optics. A short list of notable and/or large aperture Schmidt cameras. 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
Gregorian Institute of Paris thanks to the support of the new Archbishop of Paris since 1920, Louis-Ernest Dubois, and above all to the support of the monks of the Solesmes Abbey, who returned to France after their long exile to Quarr Abbey in England. That is why, taking advantage of this success, the Gregorian Institute in Paris was founded under the protection of the Cardinal. Dom Joseph Gajard of Solesmes was in charge of teaching Gregorian chant there for two years, between Wednesday and Friday. Two years later, a former student of the Schola Cantorum de Paris, Auguste Le Guennant, succeeded him, not only