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Orion Telescopes

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Beginner
*2nd* Orion SkyQuest XT4.5 Classic Dobsonian Telescope
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  • Compact and lightweight - a perfect Dobsonian reflector telescope for traveling or to easily take out to the backyard at home
  • 4.5" aperture and 900mm focal length provide clear views of lunar craters and plains on the Moon, planets, bright nebulas and galaxies
  • Sturdy and portable Dobsonian base and handy navigation knob allow for effortless maneuvering of the reflector optical tube
  • Collects a whopping 260% more light than a typical beginner-level 60mm refractor telescope - which means hundreds more objects will be visible through the Orion SkyQuest XT4.5 Classic Dobsonian
  • Includes two eyepieces (25mm and 10mm focal length Sirius Plossl), 6x30 finder scope, 1.25" rack and pinion focuser, collimation cap, eyepiece rack, Starry Night astronomy software, and more!


Item #  79804
  • Best for viewing
    Brighter deep sky
  • Best for imaging
    Lunar & planetary
  • User level
    Beginner
  • Optical design
    Reflector
  • Optical diameter
    114mm
  • Finder scope lens diameter
    26mm
  • Focal length
    900mm
  • Focal ratio
    f/7.9
  • Optics type
    Spherical
  • Glass material
    Soda-lime plate
  • Eyepieces
    Sirius Plossl 25.0mm,10.0mm (1.25")
  • Magnification with included eyepieces
    36x, 91x
  • Resolving power
    1.02arc*sec
  • Lowest useful magnification
    17x
  • Highest useful magnification
    228x
  • Highest theoretical magnification
    228x
  • Limiting stellar magnitude
    12.9
  • Optical quality
    Diffraction limited
  • Finder scope
    6x26 Correct-image
  • Focuser
    1.25" Rack-and-pinion
  • Secondary mirror obstruction
    28mm
  • Secondary mirror obstruction by diameter
    24%
  • Secondary mirror obstruction by area
    6%
  • Mirror coatings/over-coatings
    Aluminum & Silicon Dioxide
  • Mount type
    Dobsonian
  • Astro-imaging capability
    Simple moon shots
  • Computerized compatibility
    Not compatible
  • Bearing material
    PTFE and UHMW bearings
  • Tube material
    Steel
  • Tripod material
    Wood
  • Length of optical tube
    35.0 in.
  • Weight, fully assembled
    17.6 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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