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

  • Sale
  • $1,615.50
  • Regular price $1,795.00
  • TPO 10" Truss Tube f/4 Newtonian Reflecting OTA Telescope

    • Sale
    • $1,615.50
    • Regular price $1,795.00
    • ITEM #

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


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

    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
    Hightest Magnification508x
    Light Gathering Power1317x
    Limiting Magnitude15.8
    Optical DesignNewtonian
    Secondary Obstruction70mm
    Tube Diameter303mm
    Tube Length1150mm
    Tube Weight29.3 lbs
    Warranty2 Year Warranty

    Questions & Answers

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    • How much does this weigh?

      This dovetail bar weighs a little less than 3 lbs.

    • Can you advise the mirror substrate. Is it BK7 or Quartz ?

      The manufacturer does not state that the optics are made of quartz, so they are likely made of either BK7, B270, or some other sort of water white optical glass.

    • Can the brightness be adjusted through the USB cable?

      Yes, using either Optec's Alnitak software or the ASCOM driver through another manufacturer's software, you can control the brightness level at 255 discrete intervals as well as turning the panel on or off or opening or closing the panel with the motor.

    • Since this is a reflector telescope is it coma free

      Unfortunately, Newtonians are not coma free (neither are most reflectors), although with no lenses they do not have any chromatic aberrations. You can add one of a few models of coma corrector to this scope to minimize the coma for imaging, but they woul

    • How much does this weigh?

      Good afternoon and thanks for asking. The OTA weighs approximately 39 lbs.

    • How much back focus does this scope have when used with the stock focuser?

      The manufacturer does not specify the back focus, but given that you have to remove the 35mm extension to reach focus with a DSLR and Tring (55mm), the back focus is more than 65mm but less than 90mm. 75-80mm would be a good estimate, but do not rely on

    • Is the telescope has a collapsable tube? So that it can be portable? Is there any 8" model available? I am looking for Airline portable telescope. Some of the telescope can go in the check-in luggage.

      Unfortunately, no. This telescope does not have a collapsible tube, and it exceeds international carry-on standards for both weight and size. Depending on your local airline regulations, it may be possible to transport this telescope as checked baggage.