TPO 6" f/4 Newtonian Reflecting OTA Telescope

  • 154 mm Aperture.
  • f/4 Focal Ratio.
  • 610 mm Focal Length.
  • Highly Portable Imaging Specialized Newtonian.
  • Lightweight and Compact.
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  • Regular price $299.00

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TPO 6" f/4 Newtonian Reflecting OTA Telescope

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.


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


  • 2 Tube Rings.
  • 2-inch Single Speed Crayford-style focuser with 1.25-inch Eyepiece Adapter.
  • 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.

Customer Reviews

4 Based on 3 Reviews
5 ★
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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.