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A 'Dobsonian' is a type of reflector telescope. A reflector is usually a long tube with a mirror at the bottom that reflects the light back up the tube to a small diagonal mirror that turns the beam of light 90º toward the eyepiece.
The 'Dobson' part is actually the mounting method for the tube, a cradle that allows the tube to tilt and turn so that one can look all round the sky.
Sirius Optics in Underwood (1/26 Darnick St, Underwood) might be a good place, or Astro Pete's (AstroAnarchy at the Myer Centre, Queen St)
GSO 8"F6 Dobsonian
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