Watch A Complete Reflector Telescope Machined From A Single Block Of Glass | Hackaday
Schmidt–Cassegrain telescope - Wikipedia
US8134778B2 - Monolithic eccentric Mersenne-Cassegrain telescope - Google Patents
Schmidt-Cassegrain telescope (SCT)
Optical system of aplanatic telescope with a 100 m spherical primary mirror
Computational model of the SST-GATE telescope final design proposed for... | Download Scientific Diagram
Since a Cassegrain reflecting telescope has a hole in the center of the main mirror, doesn't it have a hole in the center of its field of view? - Quora