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 the larger villages of the cities' territorial rule. The seat of the bishopric was established in the city and all churches belonged to the diocese, staffed by the bishop's clergy. Most modern historians have noted how the Gregorian missionaries come across in Bede's account as colourless and boring, compared to the Irish missionaries in Northumbria, and this is related directly to the way Bede gathered his information. The historian Henry Mayr-Harting argues that in addition, most of the Gregorian missionaries were concerned with the Roman virtue of "gravitas", or personal dignity not given to emotional displays, and this would have