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Orion Observer II 70mm Altazimuth Refractor Telescope

SKU: 10275

Orion Observer II 70mm Altazimuth Refractor Telescope-Telescope-Jacobs Photo and Digital

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Orion Observer II 70mm Altazimuth Refractor Telescope

SKU: 10275

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About this product

About this product

  • A great entry-level refractor telescope for beginners looking for a quality instrument that will provide great views of the night sky
  • 70mm (2.75") aperture lens collects enough light from the night sky for wonderful views of the Moon, bright planets like Mars, Saturn, and Jupiter, and the brightest nebulas and star clusters
  • The Observer 70 AZ's altazimuth telescope mount provides smooth up/down and left/right panning motion across the sky, and the adjustable-height tripod helps make your viewing sessions comfortable
  • Includes two Explorer II 1.25"eyepieces (25mm, and 10mm focal lengths) for viewing at 28x or 70x magnification through the telescope, an EZ Finder II reflex sight for easy aiming, and a 90-degree mirror diagonal for crisp and clear night sky views
  • Can also be used for pleasing daytime terrestrial views of wildlife and scenery with a correct-image diagonal (sold separately)

More info

Thanks to its sturdy altazimuth mount and quality refractive optics, the Orion Observer 70 mm refractor telescope works well for both daytime terrestrial viewing and nighttime astronomical use. The included altazimuth mount offers intuitive up/down (altitude) and left/right (azimuth) motion to make maneuvering the telescope easy. Whether you're scanning a scenic landscape or surveying the Milky Way for star clusters, this telescope will provide a pleasant experience.

The Observer 70mm Altazimuth Refractor Telescope is well suited to beginning astronomers thanks to its versatility and simple, easy-to-use design. It is a very lightweight and compact telescope, weighing just 6.5 lbs. once assembled, so it's easy to carry to any observing location, be it out on the lawn or an hour's drive into the hills.

Its glossy black refractor telescope optical tube is made of seamless aluminum and outfitted with a smooth-action rack-and-pinion focuser which accepts 1.25" accessories and eyepieces. Housed inside the telescope tube is a multi-coated, achromatic glass objective lens that is 70 mm in diameter, with a focal length of 700mm (f/10). This lens takes in 36% more light than a 60 mm lens, meaning you'll be able to see more detail on both celestial and terrestrial objects. Compared to a 60mm refractor, the Orion Observer 70 mm and its larger optics will reward you with brighter images and, for astronomy, a larger repertoire of objects to see. You'll enjoy outstanding looks at the Moon's cratered surface, Jupiter's cloud bands and moons, Saturn and its rings, the majestic Orion Nebula, and the mind-boggling Andromeda Galaxy, to name just a few of the treasures you can see. A dew and glare shield on the objective end (or front of the telescope) helps prevent dew from forming on the optical lens and also helps block unwanted stray light.

The specially engineered altazimuth mount provides much greater stability than standard "off the shelf" altazimuth mounts. It has an altitude micro-motion control to allow very fine aiming adjustments. The refractor telescope tube and mount are supported on a sturdy aluminum tripod that adjusts to comfortable heights for the whole family to use.


  • Orion 70 mm f/10.0 refractor telescope optical tube assembly
  • 25 mm Orion Explorer II telescope eyepiece (1.25")
  • 10 mm Orion Explorer II telescope eyepiece (1.25")
  • 90§ mirror star diagonal
  • Tripod legs
  • Altazimuth yoke mount
  • EZ Finder II finder scope
  • Orion finder scope bracket
  • Tripod accessory tray
  • Dust cap
  • Altitude micro-motion control rod and thumbwheel
  • Tripod attachment screws
  • Wing nuts
  • Washers
  • Accessory tray attachment wing screws
  • Leg lock knobs
  • Yoke knobs
  • Starry Night SE astronomy software digital download insert

Technical specifications

  • Best for viewing: Lunar & planetary
  • Best for imaging: Lunar & planetary
  • User level: Beginner
  • Optical design: Refractors
  • Optical diameter: 70mm
  • Focal length: 700mm
  • Focal ratio: f/10.0
  • Coatings: Fully coated
  • Optics type: Air-spaced doublet
  • Glass material: Crown/Flint
  • Eyepieces: Explorer II 25.0mm,10.0mm (1.25")
  • Magnification with included eyepieces: 28x, 70x
  • Resolving power: 1.65arc*sec
  • Lowest useful magnification: 10x
  • Highest useful magnification: 140x
  • Highest theoretical magnification: 140x
  • Limiting stellar magnitude: 11.9
  • Optical quality: Diffraction Limited
  • Finder scope: EZ Finder II
  • Focuser: 1.25" Rack-and-pinion
  • Diagonal degrees: 1.25" 90ø Mirror Star
  • Mount type: Altazimuth
  • Astro-imaging capability: Simple moon shots
  • Computerized compatibility: Not compatible
  • Tube material: Aluminum
  • Tripod material: Aluminum
  • Height range of mount: 29.50 in. - 50.00 in.
  • Length of optical tube: 27.7 in.
  • Weight, fully assembled: 6.5 lbs
  • Warranty: One year

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    Customer Reviews

    Customer Reviews
    4.9 Based on 8 Reviews
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    Filter Reviews:
    Jenny T.
    New Zealand New Zealand
    Five star

    Was a gift he loves it. Very happy.

    Frankie R.
    New Zealand New Zealand

    I bought this for my son, he is an adult !and he loved it .

    Lauren W.
    New Zealand New Zealand
    New User

    As I’m a newbie to the world of Astronomy I have found this Telescope easy to assemble and use and look forward to many hours looking upwards.

    Scott D.
    You get what you pay for

    We bought this entry level telescope for some good views of planets and the moon for my girls 4 and 6, had some great views over the last few days. Takes a bit of getting used to and is a bit rickety, tiny bit of wind has it vibrating and it’s very difficult to get it to hold in one spot on the sky. I would recommend this for just a bit of mucking around, but if you seriously want to look at the skies and planets, probably look to spend a few hundred more and get a decent telescope.

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