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 to Gregorian chant. . Presumably because of the Second Vatican Council, this institute became that same year "Institut de musique liturgique", which in 1968 was finally attached to the Institut catholique de Paris, like other catholic institutes. The Institute also published its newsletter, which distinguished itself by its collaboration in support of the "Revue grégorienne". Gregorian Institute of Paris The Gregorian Institute of Paris was a pedagogical and religious establishment founded in Paris in 1923 having in view the musicianship of Gregorian chant. This institute was created following a Parisian congress devoted to Gregorian chant and sacred music, held in