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TPO 6" f/4 Newtonian Reflecting OTA Telescope


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  • 154 mm Aperture.
  • f/4 Focal Ratio.
  • 610 mm Focal Length.
  • Highly Portable Imaging Specialized Newtonian.
  • Lightweight and Compact.

Product Details

  • The TPO 6-inch f/4 Imaging Newtonian OTA is a portable and affordable, excellent imaging scope. Like all TPO Imaging Newtonian's, the 6-inch model is an ideal scope for anyone looking to transition from visual astronomy into astro-imaging. 

    It’s lightweight enough to be a viable choice with almost any equatorial mount, meaning that you have a wide array of options in terms of mounting and tripod selection.


    Optimum Performance

    The optics on all TPO Imaging Newtonians consist of a parabolic primary mirror and an elliptical secondary, or diagonal. The mirrors are made from B270 white water optical crown glass, which is more thermally stable than glass traditionally used on other reflectors. A 91% aluminum coating is applied, and then over-coated with a layer of quartz for ultimate durability. The primary mirror cell is very sturdy, and has six collimation knobs that can be adjusted by hand. Collimation is made even easier due to the center spot marked on the primary mirror. The diagonal mirror is held in place with a thin four-vane spider.

  • specifications

    Aperture154 mm (6")
    Camera/Eyepiece Connection2" Nosepiece
    Dawes Limit0.75 arcseconds
    Focal Length610 mm
    Focal Ratiof/4
    Highest Magnification308x
    Light Gathering Power484x
    Limiting Magnitude14.7
    Optical DesignNewtonian
    Secondary Obstruction63mm
    Tube Diameter178mm
    Tube Length572mm
    Tube Weight9.6 lbs
    Warranty2 Year Warranty
  • included items

    • 2 Tube Rings.
    • 6X30 mm Straight-Through Finder with Bracket and Base.
    • 8-inch Vixen-Style Dovetail Rail.
    • 2-inch Extension Tube with 35 mm Extension.
    • Front Dust Cover.

Product Reviews

Customer Reviews
4.4 Based on 5 Reviews
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    United States United States

    Absolutely Brilliant

    It would be an understatement to say that I love this telescope. Certainly, the image quality per dollar is unmatched. In the package, you get the OTA itself, rings, a red ***** rail, a very nice 50mm finder scope + crosshair eyepiece, and the required spacers for the main eyepiece. (The spacers are not used for AP) Balance is somewhat challenging with an imaging system on the front, but it is achievable. The scope itself is quite sharp and is awesome for visual and even better for astrophotography. It holds collimation quite well and is fairly easy to collimate. I would recommend some additional upgrades mainly to the collimation screws in the future. I was very surprised by the quality of the focuser. It is very well built and does its job without hassle. A Bahtinov mask is a recommendation for AP - I laser cut mine. It is worth noting that the tube is much longer than it needs to be and the secondary is quite deep. This results in fewer reflections and great dew/frost resistance. Please keep in mind this scope requires a coma corrector for wide-field AP. The Skywatcher Quattro F/4 corrector is the only corrector I would recommend for this application as it produces near-perfect results. This corrector is expensive, but any other corrector will result in sacrificed image quality. The finder scope can also be repurposed as a guide scope for a ZWO ASI120 mini guide camera to produce an ideal guider pixel to main pixel ratio. I machined the backplate of the guide scope to accept the guide camera and locking screws in addition to an eyepiece if need be. The primary screw focuser on the finder scope is suitable for this application and it should also be checked before use as mine was out of focus. This is some serious bang for your buck. The included images are taken by me through this OTA and guided through the finder scope. CC Comparison is courtesy of lefty7283

    Dave M.
    United States United States

    Great value

    I’ve not yet used the Tpo, but it arrived only slightly out of collimation. I wish I hadn’t been charged for shipping, but it was the last one. I hope to enjoy it, soon.

    Edwin H.
    United States United States

    Excellent quality images

    Captured 15 images of 15 - 30 minutes total exposure time on the first night out. The image quality was excellent in spite of being unable to achieve perfect collimation. Was unable to adjust the secondary mirror to put the collimator beam exactly in the center of the primary mirror. I will spend more time working on this adjustmen in tbe futuret.

    Joshua M.


    I have owned my scope for nearly a year now and have done many imaging sessions with it. Purchasing a coma corrector is an absolute must! This scope produces excellent images, but I had a few speedbumps to overcome in the beginning. First, with the supplied dovetail and rings I just could not achieve any sort of balance in Dec. I solved this by purchasing a longer dovetail to mount the rings on. Second, the secondary spider is very sensitive. It deforms very easily if you tighten your rings too much. Keep that in mind and check collimation after setting up. Third, the collimation screws in the secondary are virtually useless, I'm unsure if they were too short or what, but I replaced mine with a set up Bob's Knobs for easier and tool free collimation. And finally, the spring loaded collimation screws on the primary have tiny plastic(?) washers on them. If you overtighten, your destroy them. I replaced mine with brass washers and have had no issues. Its not stated in the Included Items list, but this scope also comes with a very nice 50mm Finder scope.

    David M.
    United States

    TPO 6' f4 first light

    Scope arrived well packaged and was shipped quickly. Too my surprise it was in perfect collimation. Finally got a chance to test it out recently (you know the scope always causes rain) and was quite happy with the imaging performance. Quick star test revealed no aberrations. My other imaging scopes are longer focal length refractors so this compact scope was a real pleasure to use. Weight of the scope complete with rings is around 13lbs. Loaded up with the guide scope and camera ran it up to 16.5 lbs. I use an Orion EQ-G Atlas mount so the weight was a non issue. Scope came equipped with rings, mounting wedge, finder and focuser extension which certainly made getting going easier. No rummaging around in my telescope junk pile to find the parts I needed. A coma corrector is a must as is true with any fast mirror. Overall a nice scope at a very nice price.