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Basic Telescope Types

  • Refractor: Uses convex lens to focus image at eyepiece
    • Chromatic Refractor: Uses a secondary lens behind the primary to better focus the individual colors.
    • APOChromatic Refractor: Uses two secondary lenses to get the best focus of individual colors. The Thomsen scope is APOChromatic, the most accurate type of refractor telescope.
  • Reflector: Uses a convex mirror to reflect light to a prism near the top of the scope which angles the light rays to the eyepiece. There are many variations of reflectors