TPO 10" Truss Tube f/4 Newtonian Reflecting OTA Telescope - Discontinued

  • Aperture: 10 inches
  • Focal Ratio: f/4
  • Focal Length: 1016 mm
  • Carbon Fiber tube
  • Cooling Fan included
  • 8x50 Optical Finder includedTPO Telescopes


  • Sale
  • Regular price $1,615.50

More on the Way* We do not currently have this in stock, but is a common item we carry. More are likely on the way as the manufacturer allows.
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TPO 10" Truss Tube f/4 Newtonian Reflecting OTA Telescope - Discontinued

The 10-inch Truss Tube Imaging Newtonian Reflector Telescope by TPO is a splendid example of a broad aperture, high speed imaging telescope ideal for wide field of view Deep Space astroimaging. It is fully compatible with DSLRs and large format CCD cameras.

This Third Planet Optics (TPO) 10-inch Truss Tube Imaging Newtonian was designed not only as a premier quality deep sky imaging instrument, but also to be capable of imaging and viewing objects within our own solar system. As the Imaging Newtonian's large secondary mirror has been optimized for full-field photographic illumination, solar system visual contrast will be somewhat reduced compared to a longer f/ratio reflector with a smaller secondary. Yet even so, with minor adjustments it can perform just as splendidly in highly detailed planetary or lunar imaging as it does by nature in deep sky imaging.

This scope is at its absolute finest when used for deep space astronomy- whether visual or imaging, as it excels in both when it comes to the farther and fainter reaches of the cosmos. With its highly polished and finely coated internal optics it promises truly high quality in its specialization, and due to that same quality it can also boast a high degree of adaptability when even minor accessories are applied to shift things more towards the closer reaches of space. All in all, this is a stellar choice for any astronomer, especially those interested in imaging.

Top Notch Optics: This TPO 10-inch Imaging Newtonian boasts truly high-quality optics which are the core of its sheer capabilities in most astronomical fields. At an extremely broad 10-inch aperture and a blazingly fast F/4 focal ratio, it is quite the beast of a scope. Both internal mirrors (primary and secondary) are ground and polished under computer control for guaranteed diffraction limited performance then coated with 91-percent reflectivity enhanced aluminum, and then coated again with a protective layer of quartz for long life.

Focuser and Other Accessories: This Truss Tube Optical Tube comes with several accessories as well. First and perhaps foremost, is a 2-inch dual speed linear bearing Crayford focuser. This heavy duty Crayford focuser has a 2-inch accessory holder, with a 1.25-inch accessory adapter, both designed with non-marring compression rings. The focuser has dual-speed focusing and makes use of two coarse focusing knobs for control. One knob has a smaller concentric knob with a 10:1 reduction gear micro-fine focusing ratio, providing exceptionally precise image control during important imaging. All focus knobs are ribbed for maximum ergonomics so as to be operable in any conditions. As an added feature to improve on the basic Crayford design, the focuser implemented with this Truss Tube features a polished stainless steel drive rail that runs the length of the underside of the drawtube. The focuser's stainless steel drive shaft presses on this drive rail to move the focuser as opposed to directly pushing against the aluminum drawtube with the steel shaft- which is the process used in traditional Crayfords, and which damages them. This change greatly expands the lifespan of this telescope.

The steel drive in question rides in a self-lubricating track that runs almost the full length of the focuser body. This supports the drive rail and its attached drawtube at all times, as opposed to a conventional Crayford focuser's two sets of small contact area roller bearings. This system manages to distribute the force over the entire drawtube, unlike the traditional design which focuses it on a few specific spots and causes flexure and wear. This system will never experience flexure or wear, much less uneven flat spots or other uneven wear. The focusers drawtube is marked out for all 51 mm of travel in both inches and millimeters with a focusing scale on top of it, providing an easy guideline to use to return to the correct focus each night after marking it down the first time you found it- saving tons of time! Another fine accessory included with this scope is the 8x50 finderscope that is, as usual, standard to all TPO Imaging Newtonian telescopes. This straight-through achromatic finderscope has a dark crosshair and a spring-loaded quick-release mounting bracket. It also has a luxuriously comfortable 13 mm of eye relief.

Convenient Mounting Plates

Two 14-5/8 inch long Losmandy-style D-plate dovetails are installed on the Imaging Newtonian. One is used to mount the Imaging Newtonian on any equatorial mount of your choice that has a sufficient payload capacity to carry the 34-pound scope and any imaging accessories you might add. The second is available to mount a photo guidescope or other accessories. Because of the 34-pound weight of the Imaging Newtonian, plus the weight of your ancillary camera equipment and any photo guidescope, installing the Imaging Newtonian on a German equatorial mount with a 90-pound or greater payload capacity is recommended. Such mounts include the 90-pound capacity Celestron CGE Pro and the 100 pound capacity Losmandy HGM Titan. We provide several such mounts and numerous others capable of sustaining this splendid scope's hefty weight!


OPT Product Number: OS-10IN-TT


Aperture254 mm (10")
Camera/Eyepiece Connection2" Nosepiece
Dawes Limit0.46 arcseconds
Focal Length1016 mm
Focal Ratiof/4
Free ShippingYes
Glass TypeB270
Highest Magnification508x
Light Gathering Power1317x
Limiting Magnitude15.8
Optical DesignNewtonian
Secondary Obstruction70mm
Tube Diameter303mm
Tube Length1150mm
Tube Weight29.3 lbs
Warranty2 Year Warranty
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