Orion Store
Orion Store
Shopping Cart
0 item(s)
HACKER SAFE certified sites prevent over 99.9% of hacker crime.
Telescopes
Mounts & Tripods
Accessories
Astrophotography
Binoculars
Sale
Gift Center
Shop by Brand
Community

{"dragByHandle":true,"dragByBody":false,"cssSelector":"ql-thumbnail","widgetClass":"OverlayWidget","bindings":{"bind0":{"element":".ql-thumbnail .Quicklook .trigger","type":"quicklookselected","fn":"function(){$.fnProxy(arguments,\'#headerOverlay\',OverlayWidget.show,\'OverlayWidget.show\');}"}},"effectOnHide":"fade","effectOnShowOptions":"{}","effectOnHideOptions":"{}","closeOnBackgroundClick":true,"effectOnShowSpeed":"1200","onScreenPadding":10,"allowOffScreenOverlay":false,"captureClicks":true,"effectOnShow":"fade","effectOnHideSpeed":"1200"}

Orion Telescopes

{ width: 340, height: 340, defaultImage: '', layers: '09969' }

Advanced
*2nd* Orion 180mm Maksutov-Cassegrain Telescope Optical Tube
Not Available
Accepted Payment
This product is no longer available for purchase.


Item #  79969
  • Best for viewing
    Brighter deep sky
  • Best for imaging
    Lunar & planetary
  • User level
    Advanced
  • Optical design
    Maksutov-Cassegrain
  • Optical diameter
    180mm
  • Focal length
    2700mm
  • Focal ratio
    f/15.0
  • Eyepieces
    None
  • Resolving power
    0.64arc*sec
  • Lowest useful magnification
    26x
  • Highest useful magnification
    300x
  • Highest theoretical magnification
    360x
  • Limiting stellar magnitude
    13.9
  • Optical quality
    Diffraction limited
  • Focuser
    Internal
  • Secondary mirror obstruction
    41mm
  • Secondary mirror obstruction by diameter
    23%
  • Secondary mirror obstruction by area
    5%
  • Mirror coatings/over-coatings
    Magnesium Fluoride
  • Mount type
    Optical Tube without Mount
  • Astro-imaging capability
    Lunar, planetary & long exposure
  • Tube material
    Aluminum
  • Length of optical tube
    22.5 in.
  • Weight, optical tube
    15.9 lbs.
  • Weight, fully assembled
    15.9 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

{"dragByHandle":true,"dragByBody":false,"cssSelector":"ql-category","widgetClass":"OverlayWidget","bindings":{"bind0":{"element":".Quicklook > .trigger","type":"quicklookselected","fn":"function(){$.fnProxy(arguments,\'#_widget328762266007\',OverlayWidget.show,\'OverlayWidget.show\');}"},"bind1":{"element":".PagedDataSetFilmstripLoader > .trigger","type":"itemsloaded","fn":"function(event, startIndex, itemCount, newItems) { QuickLookWidget.assignEvents(newItems); $(\".Quicklook > .trigger\", newItems).bind(\"quicklookselected\", function(event, source, x, y) { OverlayWidget.show(\'#_widget328762266007\', event, source, x, y); }); }"}},"effectOnHide":"fade","effectOnShowOptions":"{}","effectOnHideOptions":"{}","closeOnBackgroundClick":true,"effectOnShowSpeed":"","onScreenPadding":10,"allowOffScreenOverlay":false,"captureClicks":true,"effectOnShow":"fade","effectOnHideSpeed":"1200"}