Used TPO 10" f/4 Imaging Newtonian Telescope-11350-SOLD-

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  • $379.00
  • Regular price $619.00

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  • This is a used scope in excellent condition
  • Aperture: 10 inches
  • Focal Ratio: f/4
  • Focal Length: 1016mm
  • White rolled steel exterior, flat black interior for higher contrast


Used TPO 10" f/4 Imaging Newtonian Telescope-11350-SOLD-

11350: 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 Third Planet Optics (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.

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 low vibration cooling fan is built into the primary mirror cell of the telescope to assist in cooling your optics down quickly. The fan is powered by a eight (8) AA batteries (not included) which are housed in an external battery pack.

A 3.3 inch dual-speed Crayford-style focuser rounds out this package. The ridged focusing knobs are easy to turn, even with gloves on, and the 10:1 microfocusing dial allows for very small changes, or tweaks, in focus. It takes ten turns of the microfocusing knob to equal just one turn of the larger knob. 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 3.3 inch opening steps down to a 2 inch compression ring adapter, and you will receive 1.25 inch compression ring adapter so that you can make use of all your eyepieces. A 35mm extension tube is also included to help you match the back-focus requirements of your imaging equipment. This is one nice focuser, and due to its steel drive rail and other upgrades, you will find that it suffers from very little flexure, even under heavier imaging payloads.

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 8x50 straight-through finderscope. The ocular has a non-illuminated crosshair and has 13mm of eye relief. A quick-release mounting bracket is also included.



Aperture254 mm (10")
Focal Length1016mm
Focal Ratiof/4
Optical DesignNewtonian
Optical DesignNewtonian Reflector
Warranty90 Day


  • TPO 10 f4 imaging Newtonian OTA
  • 3" dual-speed Crayford style focuser
  • Cooling Fan
  • Dual hinged rings with Vixen-style dovetail
  • 8X50 straight-thru finder
  • All original packaging


Ask a Question
  • Hi is there a central Mark on the primary for collimation?

    Yes, the primary is center-spotted for collimation.

  • I see that this is primarily an astrograph. I do plan on using with my DSLR, but would this scope be appropriate for general optical viewing as well with my son?

    Hi Curtis, Yes, you will be able to use the scope for visual use as well. It would actually make a nice visual wide field scope and that low power wide field will make it easy to find objects. thank you, Sean

  • What is the maximum capacity of this mount?

    The manufacturer states 50 lbs including counterweights. Because of the "bottom-heavy" design of the SXD2 (RA and DEC motors and housings act as a partial counterweight), the maximum payload is around 30-35 lbs with 15-20 lbs of counterweights (as long a

  • Several questions about the tube itself: First, is the inside of the tube baffled or just painted? Second, the specification tab says the OD of the tube is 257.1mm, which (allowing for a nominal wall thickness for the tube) would suggest the ID of the tub

    The OTA is not Baffled. O.D. of OTA is 12" The OTA extends 9.5" for the center of the focuser. Distance from primary to secondary is 26.5" Secondary mirror is 3.25" Minor Axis

  • Hello! Question: is it right to say that this telescope is an astrograph? If not, what kind of accessories do I need for astrophotography to fit and focus my Canon 600D to get the images?

    Yes, It is an astrograph. You will need a coma corrector and a T-ring for you 600D Corrector: T-Ring:

  • What ASCOM focus motor will work with the focuser on this telescope?

    The Robo Focus and Rigel Focuser will work. We can special order them.

  • What is the size of the image circle?  Is it compatible with full-frame DSLRs?  If so, what accessories are required to allow such use? 

    The maximum image circle depends on the coma corrector used with these fast Newtonians. Generally, most coma correctors will only cover up to APS-C format, although a couple like the Baader Rowe Corrector and ASA Wynne will cover larger image circles (up

  • How much backfocus is available for this telescope with the various adapters?

    If you are using a coma corrector like an MPCC, the back focus is restricted by the specific design of the coma corrector (usually around 55mm, sometimes a bit longer). Without a coma corrector, the usable back focus is around 70-80mm as you need a 35mm e