Types of telescope: Refractor, reflector, Newtonian or Dobsonian? | T3
Isaac Newton Telescope - Wikipedia
VENDO: vendo telescopio newtoniano 15 cm f/4 + correttore di coma | Astrosell
Sir Isaac Newton's reflecting telescope, known also as the Newtonian telescope. It worked by concentrating light by reflection from a parabolic mirror, instead of by refraction through a lens. Newton (1642-1727) first