World Leaders in Astronomical Equipments, Education & Services since 2001

GSO 10″ Dobsonian (Silver)

Original price was: ₹52,533.90.Current price is: ₹45,762.71. (Ex. GST)-13% OFF

  • A good priced Dobsonian with very good diffraction limited optic and enhanced 94% coating. This Dobsonian telescope is a specialist for deep sky. Many amateurs say that “real” deep-sky observing begins with 10″ aperture. Many galaxies will reveal their spiral structure. Fine detail in gas nebulae and planetary nebulae will become visible. Globular clusters are no longer just a “blur” or faint light, but instead you will see them dissolved into myriads of individual stars clustered together. At the same time the GSO250 is very well suited for observing moon and planets.

The GSO 250mm is still portable. Despite its huge aperture the telescope can still be handled by one person. The tube is short enough to still fit on the backseats of a normal car.

  • High quality parabolic optic with 250 mm diameter and 1250 mm focal length.
  • 94% enhanced coating for a brighter image.
  • Precise 2″ Crayford focuser for comfortable focusing – ready for 1.25″ and 2″ accessories.
  • Solid steel tube and adjustable mirror cells for perfect collimation and good images.
  • Upgradeable for astrophotography.
  • Cooling fan – reduces the cooling down time of the telescope

Dobsonian Telescopes from GSO offers a lot of telescope for the money. They are often purchased for beginner due to their simplicity and ease of use. Dobsonian telescopes are designed for visual observing. GSO Dobsonians have better coating and high quality mirrors for maximum success and fun under the skies. Its cost/performance ratio is truly unbeatable.

  • Excellent Visual Performance: For best possible image quality you need high quality optics as well as optimized mechanics. The GSO Dobsonian has both. The thin spider vanes improve contrast and image sharpness compared with a simpler spider with thick vanes. The 94% enhanced coating on main mirror and secondary mirror produces a brighter image. Save up to 10% light against other telescopes with same aperture.
  • Grab-And-Go Setup: The simple and intuitive way to use this telescope makes it much easier for beginners to spend their first joyful hours under the starry sky. Set-up is as easy as you can imagine: just put the rocker box on the ground, insert the telescope tube and put the springs in position and you´re ready to go!
  • Primary Mirror Cooling Fan: Until a mirror is properly cooled down it will create currents of warm air that will deteriorate the image – no matter which mirror substrate is used. Only after the mirror has cooled down this effect stops. The cooling fan reduces the cooling down time.
  • Upgrade your Dobsonian: A Dobsonian telescope from GSO is a perfect starter telescope. You will get a high end optic for an incredible low price. Later you can upgrade the telescope with eyepieces, filters or with cradle rings to mount it upon a parallactic mount. Than you also can start with astrophotography through your Newtonian telescope.
  • Optical performance: The telescope is equipped with high quality GSO mirrors. The selected main mirror is better, than diffraction limited. We always make optical tests on our optical bench to guarantee the high optical level of GSO Newtonians and Dobsonians.
  • The 2″ Crayford Focuser: A central part of the telescope is the good 2″ Crayford focuser with many advantages:
  • Much smoother focus motion compared with simpler focusers.
  • Secure and scratch-free grip on the eyepieces through use of a brass compression ring (both 1.25″ and 2″)
  • No image shift. This means that the object will remain precisely in position while you focus. Simpler focusers tend to be shifted a little bit out of alignment, resulting in a relative movement of the object. This somewhat annoying effect does not occur in the Crayford focuser.
  • No play when you reverse the focusing direction. The focuser will reverse the direction in which it moves instantaneously when you change the direction in which you turn the focus knobs.
  • Centering and Tracking Objects with the GSO Classic Dobsonian.
  • The mount of a Dobsonian telescope is called “Rocker-Box”, a fitting name for the uniquely simple and well-working design.
  • The rocker allows you to point the telescope at any point in the sky and allows for comfortable, intuitive movement. Moving the telescope is very simple, just push the telescope into the right direction ? no need to use clamps or motors, it doesn’t get more simple than this! Since you need to move the Dobsonian manually it is particularly important that the movement be as smooth as possible. The Dobsonian has an azimuth roller bearing for smooth operation.
  • For the elevation, the telescope is equipped with the Spring Tension System. This prevents the telescope from moving for example when exchanging eyepieces.

Available on backorder


GSO 10″ Dobsonian (Silver) Specifications

Optics Info

  • Parabolic main mirror – BK7 optical glass
  • Aperture: 250 mm – 10″
  • Focal Length: 1250 mm
  • Focal Ratio: f/5
  • Secondary Mirror: 64 mm diameter
  • Obstruction: 25.6% linear
  • Collimating help:Center mark on the main mirror
  • Focuser: 2″ Crayford focuser with 1.25″ reducer
  • Tube: Steel tube
  • Tube weight: 12.2 kg
  • Tube length: 1210 mm
  • Tube diameter: 305 mm
  • Rockerbox mount weight:12.2 kg
  • Rockerbox mount dimensions: Height 640 mm / Diameter 540 mm
  • Movement: Elevation Spring Tension System/ Azimuth Roller Bearing System

In the Box

  • GSO Dobsonian Telescope
  • hRockerbox – azimuthal mount
  • Fan with battery holder
  • 8×50 finder with achromatic objective
  • 25 mm 1.25″ Super Plössl eyepiece and 9mm 1.25″ Super Plössl eyepiece
  • 2″ 35 mm extension tube
  • Manua

Solar Warning: Never look directly at the Sun with the naked eye or with an optic (unless you have the proper solar filter). Permanent and irreversible eye damage may result. Never use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it. Never leave your optic unsupervised. Make sure an adult who is familiar with the correct operating procedures is with your optic at all times, especially when children are present.

Support Documents

GSO 8inch-12inch Dobsonian Manual

Supporting Videos

  • This video is made using GSO 8″ Dobsonian. This is for reference. Results would be better than this.

Recommended Accessories

  • 1.25″ 2X Achromatic Barlow – To get more magnification while observing your favorite planet
  • Universal Smartphone Adapter – To capture pictures of Moon and planets right in your smartphone immediately as you observe it.
  • T-Ring (Canon) – To capture photos with your Canon EOS DSLR using Telescope tube as high focal length lens for camera.
  • T-Ring (Nikon) – To capture photos with your NIKON DSLR using Telescope tube as high focal length lens for camera.
  • T-Ring (Sony) – To capture photos with your Sony DSLR using Telescope tube as high focal length lens for camera.
  • 1.25″ T-Mount/Adapter – To attached any DSLR directly in the eyepiece barrel when using in combination with DSLR TRing.
  • Customized Telescope Padded bag:Designed to keep your Telescope safe from sudden damages to optics and body, safe of dust and dirt, easy carrying solution.

World Leaders in Astronomical Equipments, Education & Services since 2001

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