TPO 6" f/6 Newtonian Reflecting OTA Telescope

  • Aperture: 152 mm (6 inches).
  • Focal Ratio: f/6.
  • Focal Length: 916 mm.
  • 14.3 lbs.
  • Flat black interior for higher contrast.
  • Sale
  • Regular price $199.00

In Stock
Free Shipping
Add to Wishlist
Already have gear? Trade it in for cash or new equipment.

Accessories Added

OPT Telescope Expert

Want Help?

Ask Our Telescope Experts


TPO 6" f/6 Newtonian Reflecting OTA Telescope

The 6-inch f/6 Imaging Newtonian Telescope OTA and Focuser by Third Planet Optics (TPO) has optics carefully designed for wide field views and spectacular imaging. Get the performance of a Ritchey Chretien without the cost. Capture images with a DSLR, small webcam or all the way up to a large sensor CCD camera with this inexpensive yet effective Newtonian.


The optics on all TPO Imaging Newtonians consist of a parabolic primary mirror and an elliptical secondary, or diagonal. Made from B270 white water optical crown glass, 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. There's a perfectly centered dot in the middle of the primary so you know exactly where your laser collimator should point. 


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. 

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.


TPO 6 inch f/6 Imaging Newtonian Features

  • 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.
  •  6x20 straight-through finderscope with a non-illuminated crosshair and 13 mm of eye relief.
  • A quick-release mounting bracket.
  • Length: 23 inches.


Aperture152 mm (6")
Camera/Eyepiece Connection2" Nosepiece
Dawes Limit0.76 arcseconds
Focal Length916 mm
Focal Ratiof/6
Free ShippingYes
Highest Magnification304x
Light Gathering Power472x
Limiting Magnitude14.7
Optical DesignNewtonian
Secondary Obstruction45mm
Tube Diameter178mm
Tube Length840mm
Tube Weight14.3 lbs
Warranty2 Year Warranty
Customer Reviews
4.7 Based on 7 Reviews
Write a Review Ask a Question
  • Reviews
  • Questions

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
Joe L.
United States United States
Great Scope

I was using a Bresser 5.1 inch reflector for a few years and decided to upgrade. Like many people, I don't have tons of cash to spend on astronomy, but this ota fit my budget perfectly. I've used it several times now and have been very happy. It arrived quickly and was well packaged. Collmination is super easy. My orion raci mated perfectly with the base made for the included spotter. So no problems there. (Although I haven't used the included spotter much, I will say it is of good quality. Metal bracket, metal tube, clear optics, clear images. Better quality than most spotters that I have used in the past.) When I used the telescope for the first time I was pleasantly surprised by the bright and clear views. Clusters looked great. The moon looked amazing. Planets showed impressive details. DSO's were breathtaking. And for the first time, I was able to see Polaris' little companion. The ota itself is of high quality. It looks good, it feels strong and came blemish free. The crayford style focuser is very nice touch. It is robust and focuses quite nicely compared to rack and pinion style focusers that Iam used to.This one is focuses like a dream. All and all, I'm very satisfied with my purchase. So much, that I've also purchased a celestron CG4 to compliment this OTA. I highly recommend this tube assembly, and suggest the 35mm eyepiece extension.

Chase W.
A Very Good Scope

Upon purchasing this scope, it told me to expect it on my doorstep within 7-10 business days. It took 11, but that is splitting hairs, and I can't say that this is a real complaint. Once it arrived at my house, I noted that it was quite sturdily packaged with a good few layers of Styrofoam. This did not help the fact that it was not properly collimated upon checking, but this is likely due to shipping. The secondary mirror vanes are quite flimsy, and you may need to collimate more regularly for best results - this is to be expected, however, considering some corners must be cut to achieve such a low price. The mirror quality is excellent in both the primary and secondary, and in both visual and astrophotography, coma is not horrible given it is f/6. Image quality is nice and crisp. For a single speed focuser, the focusing quality is very good for what it is worth. All and all, I foresee myself buying from TPO again.

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.