English Bahtinov mask Cited by user Dawnseeker2000 on 27 Jul 2019 The Bahtinov mask is a device used to focus small astronomical telescopes accurately.
English Meade LX200 Cited by user Dawnseeker2000 on 23 Apr 2019 The Meade LX200 is a family of commercial telescopes produced by Meade Instruments launched in 1992 with 8" (20.32 cm) and a 10" (25.4 cm) Schmidt–Cassegrain models on…