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 mission is often suggested that the Gregorian missionaries introduced the Rule of Saint Benedict into England, there is no supporting evidence. The early archbishops at Canterbury claimed supremacy over all the bishops in the British Isles, but their claim was not acknowledged by most of the rest of the bishops. The Gregorian missionaries appear to have played no part in the conversion of the West Saxons, who were converted by a missionary sent directly by Pope Honorius I. Neither did they have much lasting influence in Northumbria, where after Edwin's death the conversion of the Northumbrians was achieved by missionaries from