Telescope Making No. 16 (Summer 1982) - My Science Shop
Two-mirror tilted component telescopes
6" f/29 Schiefspiegler Optics Set | Astromart
Alan Clark Heslop, 1937-2012 - Document - Gale Academic OneFile
Schiefspiegler - Wikipedia
Jim's 10 inch f/8 catadioptric Herschelian Schiefspiegler telescope – Jim Chung's Ramblings
Oleguer Nogues on Twitter: "cooling down my #schiefspiegler telescope, see if I can get some lunar crisp images this evening at firect focus with DSLR camera https://t.co/a08kyBhov3" / Twitter
Cassegrain reflector - Wikipedia
Interesting Tetra-Schiefspiegler Design - ATM, Optics and DIY Forum - Cloudy Nights
A guest blog: More than a Telescope - Astronomy Magazine - Interactive Star Charts, Planets, Meteors, Comets, Telescopes