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Orion Telescopes

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Intermediate
*2nd* Orion 10" f/3.9 Newtonian Astrograph Reflector
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Item #  78296
  • User level
    Intermediate
  • Optical design
    Reflector
  • Optical diameter
    254mm
  • Focal length
    1000mm
  • Focal ratio
    f/3.9
  • Optics type
    Parabolic
  • Glass material
    Low thermal expansion glass
  • Resolving power
    0.46arc*sec
  • Lowest useful magnification
    25x
  • Highest useful magnification
    300x
  • Highest theoretical magnification
    500x
  • Limiting stellar magnitude
    14.7
  • Optical quality
    Diffraction limited
  • Finder scope
    9x50
  • Focuser
    2" dual-speed Crayford
  • Secondary mirror obstruction
    82mm
  • Secondary mirror obstruction by diameter
    32%
  • Secondary mirror obstruction by area
    10%
  • Mirror coatings/over-coatings
    Enhanced Aluminum & Silicon Dioxide
  • Mount type
    Optical Tube without Mount
  • Astro-imaging capability
    Lunar, planetary & long exposure
  • Tube material
    Steel
  • Length of optical tube
    38.6 in.
  • Weight, optical tube
    25.5 lbs.
  • Additional included accessories
    Other included items are not always the same between a new and a second. Seconds may be older versions of the new product, or may be customer returns where accessory substitutions have been made.
  • Other features
    2nds are covered by Orion's Satisfaction Guarantee
  • Warranty
    One year

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