Orion - Observer 70mm Altazimuth Refractor

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Thanks to its sturdy altazimuth mount and quality refractive optics, the Orion Observer 70mm refractor telescope works well for both daytime terrestrial viewing and nighttime astronomical use.

SKU: ORI-09881
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Product Description

Orion Observer 70mm Altaz Refractor

Thanks to its sturdy altazimuth mount and quality refractive optics, the Orion Observer 70mm 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.

  • 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)


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 70mm in diameter, with a focal length of 700mm (f/10). This lens takes in 36% more light than a 60mm lens, meaning you’ll be able to see more detail on both celestial and terrestrial objects. Compared to a 60mm refractor, the Orion Observer 70mm 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 found in many department stores. 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.

The Observer 70mm telescope comes with everything you need to start observing the night sky right away. Standard accessories include an Orion EZ Finder II reflex sight which helps you easily aim the telescope, a 90° mirror star diagonal that provides bright nighttime views at a comfortable angle, two 1.25” telescope eyepieces, and an accessory tray for the tripod so you can keep your eyepieces ready for action. The included 25mm eyepiece provides 28x power magnification, while the higher power 10mm eyepiece boost the magnification up to a substantial 70x power for up close views.

To make the Orion Observer 70 perform as a high-quality daytime telescope to scan scenery, wildlife and more, an optional 45° correct-image diagonal can be substituted for the 90° diagonal. This optional accessory will make the Observer 70 yield a view with correct, non-reversed daytime orientation. Correct-image 45° diagonals are sold separately by Orion.

The Orion Observer 70 Altazimuth refractor is a telescope that will keep any observer entranced for years. Get in on the fun today!








Name Orion - Observer 70mm Altazimuth Refractor
Manufacturer Orion
Model ORI-09881
Custom Stock Status Ships in 3-5 Days
Telescope Aperture 3" and Under
Aperture 70mm
Eyepieces Explorer II 25.0mm, 10.0mm
Finderscope EZ Finder II
Focal Length 700mm
Focal Ratio f/10.0
Focuser 1.25" Rack-and-pinion
Highest Useful Magnification 140x
Limiting Stellar Magnitude 11.9
Lowest Useful Magnification 10x
Mount Altazimuth
Optical Coatings Fully coated
Optical Design Refractors Crown/Flint glass
Optical Tube Aluminum
Optical Tube Length 27.7 in


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