Orion 120mm f/5.0 Refractor OTA

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Orion 120mm f/5.0 Refractor OTA

Orion 120mm f/5.0 Refractor OTA

Are you looking for a refractor telescope body that's short on length and long on light grasp? The the Orion 120mm f/5.0 Refractor OTA is right for you.

This compact, large-aperture Orion 120mm F/5.0 Refractor Telescope Optical Tube is perfect for deep-sky pursuits. Its 120mm (4.7"), multi-coated achromatic telescope lens assembly and modest 600mm focal length combine to provide breathtaking wide-field views. With an optional 25mm Plossl telescope eyepiece, this telescope serves up a sprawling 2.1-deg swath of sky! The fast f/5.0 optical system also makes it an excellent telescope for astrophotography. The 26"-long optical tube is well baffled to ensure good contrast. The cast-metal 2" rack-and-pinion focuser accommodates either a 1.25" or 2" diagonal, so you can use 1.25" or 2" telescope eyepieces. Tube color is gunmetal gray metallic. A mounting base molded into the focuser casting to accept an optional Orion finder scope or EZ Finder II.

For those who already have the amenities like finderscope, eyepieces, mount and tripod - this is a dream come true. You don't pay extra for what you don't need. Perhaps you'd rather customize the way your scope is built from the ground up? Again, the Orion 120mm f/5.0 Refractor OTA is what you're looking for.

This small, high quality refractor is a winner all the way around!

Orion Product Number: 9836

Drop-Ship Policy Note: To expedite your order, this telescope (or mount) will be drop-shipped directly from Orion's warehouse to you and availability will be based on Orion's inventory levels. OPT will contact you immediately if there are any delays on shipment and will provide an estimated lead-time. If the product is not readily available, you will have the option to keep the order open with a 10% deposit. Additional Orion items may be drop-shipped along with the telescope (or mount), or shipped directly from our own OPT stock. Non-Orion items will be shipped directly from the OPT warehouse. As a courtesy, OPT will cover all costs for splitting orders and separate shipments.

If a return issue should arise with an Orion drop-ship item, please note that OPT will be required to issue a minimum 10% restocking fee for its return to Orion. With this exception, all other conditions of the OPT return policy apply. Please feel free to call us at 1-800-483-6287or e-mail us if you have any questions on Orion Drop-Ship product availability or on this policy. We're here to serve you!


Aperture119 mm (4.69")
Aperture119 mm (4.7")
Aperture120 mm (4.72")
Camera/Eyepiece Connection1.25
Dawes Limit0.97 arcseconds
Dew Shield IncludedYes
Exterior ColorOrion Grey Pearl
Focal Length600 mm
Focal Ratiof/5
Highest Magnification240x
Highest Useful Magnification240x
Light Gathering Power294x
Limiting Magnitude14.1
Limiting Stellar Magnitude13.1
Optical DesignDoublet
Tube Length635mm
Tube Weight8.6 lbs
Warranty1 Year Warranty
Customer Reviews
5.0 Based on 2 Reviews
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Unbelievable value...

There is probably not a better value in any category of scope, be it a reflector, refractor, or SCT. Yes, there is a good amount of chromatic aberation when viewing bright objects. And yes, the CA shows up in One-Shot color images. This is largely attributable to the very fast f/5 optics. But where this scope excels, at least for me, is in narrowband imaging. I have had great success imaging in Ha, Oiii and Sii where CA is not an issue. The large aperture and fast optics are perfectly suited to this kind of work. I find it somewhat amusing that I have a $250 scope on a $3,000 mount using a $5,000 camera to do this narrowband imaging. But it works, and that's what counts. And it's much easier to use than any Newt or SCT considering there are no collimation issues. The only thing I didn't like about the scope was the stock focuser, a problem that was easily solved by purchasing an upgraded Orion focuser with a 10:1 fine focus.

120mm f/5.0 achromat

I'm using this fast achromat for deep sky imaging. I increased the focal length to 750 mm with a 1.5 x barlow and gave a nice image scale to the Dumbell Nebula (M27. The chromatic aberration effects present in achromats could largely be removed in post-processing of the image that I took. The image of M27 I took with this scope is here: http://revans_01420.webs.com/apps/photos/photo?photoid=54917719 Overall I would give this scope 5 stars because of its reasonable price and its potential capabilities. Good deep sky imaging is within reach with this scope, but some post-processing to remove violet halo's etc. will help a lot with an impressive final image.