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TPO 6" f/6 Newtonian Reflecting OTA Telescope

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  • Aperture: 6 inches
  • Focal Ratio: f/6
  • Focal Length: 916mm
  • White rolled steel exterior, flat black interior for higher contrast


TPO 6" f/6 Newtonian Reflecting OTA Telescope

The 6-inch f/6 Imaging Newtonian Telescope OTA and Focuser by Third Planet Optics (TPO):


If you are looking for a telescope that does a great job of imaging but doesn't come with the cost of a Ritchey-Chretien, check out the TPO Imaging Newtonian line of telescopes! All of our Imaging Newtonian optical tube assemblies, offered in apertures from 6 inch - 12 inch, have very fast optics for the widest fields possible. Image with a DSLR or small webcam all the way up to large sensor CCD cameras with these inexpensive yet effective Newtonians.

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 the ultimate in durability. The primary mirror cell is very sturdy, and has six collimation knobs that can be adjusted by hand with a push or pull of the knob. 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.

There's a perfectly centered dot in the middle of the primary so you know exactly where your laser collimator should point. You stick the laser in where the eyepiece goes, so it bounces off of the secondary to the primary. If the primary is center marked, then all you have to do is match up your laser dot to the marked dot and you're collimated!

The optical tube assembly on the TPO Imaging Newtonian telescope is made of rolled steel and painted white. The ends of the tube are die-cast aluminum, which contribute to the OTA's rigidity. Steel is a bit heavier than traditional aluminum, but since it has a lower coefficient of thermal expansion, your telescope will tend to hold its shape (and therefore, hold focus) as temperatures fluctuate throughout the night. The inside of the OTA is painted in a matte black finish, which stops stray light in its tracks.

A single speed Crayford-style focuser rounds out this package. There is also a little knob on the bottom of the focuser that controls the tension, so that you can make adjustments depending on the weight or distribution of your load. You will also receive a 1.25 inch compression ring adapter for use with 1.25 inch eyepieces.

The telescope comes with dual split-hinged mounting rings that are made of die-cast aluminum and felted on the inside to cradle the OTA without scratching. There are threaded holes on the underside of the rings that allow installation on either a Vixen-style (included) or Losmandy-style dovetail plate. The top of the rings is also drilled so that you can mount accessories.

All TPO Imaging Newtonians come with an 6x20 straight-through finderscope. The ocular has a non-illuminated crosshair and has 13mm of eye relief. A quick-release mounting bracket is also included.

TPO 6 inch f/6 Imaging Newtonian Highlights


  • 2 inch single-speed linear Crayford-style focuser with 1.25 inch adapter
  • 6X30 White Crosshair Finderscope with Bracket & Dovetail Shoe
  • Dual hinged rings with Vixen-style dovetail
  • Length: 23 inches


Aperture152 mm (6")
Camera/Eyepiece Connection2" Nosepiece
Dawes Limit0.76 arcseconds
Focal Length916 mm
Focal Ratiof/6
Free ShippingYes
Hightest Magnification304x
Light Gathering Power472x
Limiting Magnitude14.7
Optical DesignNewtonian
Secondary Obstruction45mm
Tube Diameter178mm
Tube Length840mm
Tube Weight14.3 lbs
Warranty2 Year Warranty

Customer Reviews

4.8 Based on 5 reviews
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mark g.
United States

6 f 6 refelector telescope

this is a very good all around scope , i have only used a couple times the views are very good . i recommend it to anyone on a budget as i am

James R.
United States


Sorry to say due to weather haven't had a good chance to use it yet , I've missed two meteor showers and a comet . when the weather improves I expect to use it a lot.

United States

Best budget scope for a sort of all around use

Crisp and clear images both visual and for camera imaging! If you could only have one scope, I think this one will fit the bill nicely. I had a 4.5-inch F8 reflector that was good enough for planetary but I was wanting more resolving power and a 6-inch reflector is the max for my mount. Why would this be an all-around scope? Because for the aperture size 6-inch and at F6, it gives you a wide and fast enough field of view for some of the brighter deep sky objects like the Orion Nebula and Andromeda. Coma isn't much of an issue also because I use a crop sensor (micro4/3). Furthermore, the focal length of this scope at 900mm is just the same as the 4.5" F8 reflector I had that gave me enough planetary magnification for Saturn and Jupiter. I should have crisper views and images on the next planetary viewing season, can't wait!


Excellent budget astrophotography scope

Scope arrived in good condition and collimation wasn't far off. The focuser is only one speed, but I had no trouble focusing with a bahtinov mask. I stuck in on my AVX and on the first night out, I managed to get an image of M33 that put one I took with an ES 80mm APO to shame. Being an F6, coma isn't terrible, so I was able to more-or-less fix that in StarTools. I'm not sure what more you could ask for at this price. Highly recommended.


good for price

ive owned this scope since march, for the price its fairly decent the only change i would make is add a dual speed focuser. good wide field views for clusters and nebulas but not super high mag unless you go sub 5mm focal lenght ep's. Nice bright views that surprised me galaxies show nice bright cores and orion shows its wings nicely. For the price you cant go wrong its a great compact scope thats easy to transport and set up alone. Only issue is the black paint inside the tube had flaked some but i hit the tube with a thicker flat black primer thats holding up well. grab one ya wont be sorry