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"}

 23 of 24 
Orion Telescopes

{ width: 340, height: 340, defaultImage: '', layers: '10066' }


Beginner
*2nd* Orion StarSeeker III 90mm GoTo Mak-Cass Telescope
Was 
$399.99
Now 
$339.99
You Save 
$60.00
 
Accepted Payment
In Stock


Item #  70066
  • Best for viewing
    Lunar & planetary
  • Best for imaging
    Solar, lunar & planetary
  • User level
    Beginner
  • Optical design
    Maksutov-Cassegrain
  • Optical diameter
    90mm
  • Focal length
    1250mm
  • Focal ratio
    f/13.9
  • Optics type
    Spherical
  • Eyepieces
    Explorer II 25.0mm,10.0mm (1.25")
  • Magnification with included eyepieces
    50x, 125x
  • Resolving power
    1.29arc*sec
  • Lowest useful magnification
    13x
  • Highest useful magnification
    180x
  • Highest theoretical magnification
    180x
  • Limiting stellar magnitude
    12.5
  • Optical quality
    Diffraction limited
  • Finder scope
    EZ Finder II
  • Focuser
    Internal
  • Diagonal degrees
    1.25" 90° Mirror Star
  • Secondary mirror obstruction
    29mm
  • Secondary mirror obstruction by diameter
    32%
  • Secondary mirror obstruction by area
    10%
  • Mount type
    Altazimuth
  • Astro-imaging capability
    Lunar & planetary
  • Computerized compatibility
    Go-To included
  • Alignment procedure
    2-Star GoTo Alignment
  • Number of objects in database
    42,000+
  • Tracking rates
    Sidereal, Solar and Lunar
  • Power requirement
    8-AA batteries or 12-volt DC
  • GPS
    Sold separately
  • Backlash compensation
    Yes
  • Available ports
    RS-232
  • Tube material
    Aluminum
  • Tripod material
    Aluminum
  • Tripod leg diameter
    2.00 in.
  • Height range of mount
    31.10 in. - 52.50 in.
  • Length of optical tube
    11.0 in.
  • Weight, optical tube
    3.2 lbs.
  • Weight, mount/tripod
    6.9 lbs.
  • Weight, fully assembled
    10.7 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,\'#_widget276264472092\',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(\'#_widget276264472092\', event, source, x, y); }); }"}},"effectOnHide":"fade","effectOnShowOptions":"{}","effectOnHideOptions":"{}","closeOnBackgroundClick":true,"effectOnShowSpeed":"","onScreenPadding":10,"allowOffScreenOverlay":false,"captureClicks":true,"effectOnShow":"fade","effectOnHideSpeed":"1200"}