A high-quality Dobsonian telescope with high-quality optics and a 300mm 12 inch aperture. GSO Dobsonians feature the highest quality mirrors and impress due to their reasonable prices. This telescope is ideal for deep sky observation.

The largest solid-tube GSO Dobsonian. You require an estate car or a van for transportation but the 300mm aperture offers unforgettable observing experiences. Nebulae and galaxies are displayed with details which are reminiscent of astrophotography.

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.

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!
 
What's In The Box
GSO Dobsonian Telescope
Rockerbox - azimutal mount
Fan with battery holder
8x50 finder with achromatic objective
25 mm 1.25" Super Plössl eyepiece
9 mm 1.25" Super Plössl eyepiece
35mm 2" extension
PDF Manual
Plus a host of Free Items
 
Why chose a GSO Dobsonian Telescope over other brands ?
GSO makes the World's Finest Astronomical Mirrors with surface accuracy of 1/12 wave.
GSO Nightwatch Dob come with a 1.25" Plossl eyepiece for Planetary and Deep Space Observation.
Comes with a large 8x50 Multi-Coated Achromatic Finderscope
GSO's CNC Machined Crayford focuser is a 2" Focuser which can accept both 1.25" and 2" eyepieces.
GSO Dobsonian Telescopes are fully manufactured using CNC Machines and they are MADE IN TAIWAN, not CHINA like other brands.
 
Please Download INSTRUCTION MANUAL in PDF from the link provided below.

Value for Money
The optical performance of this reflecting telescope is outstanding, thanks to a high-quality primary mirror and improved mirror coating. The telescope also boasts very robust mechanics and ease of use. Dobsonian telescopes provide maximum astronomical performance within their price range.

 
Contrast and Sharpness
We recommend these telescopes to every amateur astronomer who wants to have fun observing. Due to better anti-reflective properties, nebulae and galaxies appear even brighter than in similar telescopes of the same aperture. The amount of detail observable on the Moon and planets is particularly good. The secondary mirror has been optimized and minimal obstruction; its thin spider vanes mean improved contrast and sharpness.
 
Setting up and getting started
GSO Dobsonians are simply and robustly designed, so even beginners will have no problem getting to grips with these telescopes. The instrument is ready for use within just a few minutes. Set down the rocker box - the lower part of the device - hang the tube with the round altitude bearings wheels into the receivers and tighten the springs. The instrument is then ready for observing.
 
Add-on options
GSO Dobsonians provide an ideal start in astronomy - you get a high-quality telescope. If then, later, you become interested in, for example, astrophotography, you can buy accessories that allow you to use the Newtonian on an equatorial mount. Also filters, additional eyepieces, corrector systems or even bino-viewers are available from us for this telescope.
 
The quality of the main mirror
The main mirror is the most important element involved in producing the image. We use selected GSO mirrors of the highest quality. Each mirror's performance is significantly better than diffraction-limited, guaranteeing you will enjoy your observing.
 
The Crayford focuser
a robust Crayford has some significant advantages over a simple rack and pinion focuser:
smooth and sensitive adjustment for precise focusing even at high magnification
gentle clamping of eyepieces and adapters via a clamping ring - so no screw pressing directly onto the eyepiece and possibly tilting it out of the optical axis.
the use of ball-bearings means the image does not tilt during focusing - a problem with many cheap focusers.
 
Location and tracking of astronomical objects
The location and also the tracking of nebulae, galaxies and planets take place by hand with this telescope. For this reason, smooth and accurate movement is essential. A tension spring for elevation ensures controlled counter-pressure when slewing. So the telescope will not lose the object in view if, for example, the eyepiece is changed. The horizontal axis is also equipped with ball-bearings, ensuring smooth movement.
 
Active main mirror ventilation
Telescopes are not always kept directly at the observing site. This can result in the primary mirror being at a different temperature to that of the environment. A fan, located behind the main mirror holder, blows the cooler air from outside onto the back of the main mirror, thus reducing the cooling time. Also, warm air from the OTA interior is removed faster.

TELESCOPE SPECIFICATION

TELESCOPE SPECIFICATION
Country of Manufacturing	TAIWAN
Optical Design	Newtonian reflecing Telescope
Primary Mirror	12 inch Paraboli 1/12 wave. Precisely figured parabolic mirror - diffraction limited / BK7 94% enhanced coating
Diameter	304mm
Focal Length	1520mm
Focal Ratio	F/ 5
Highest Practical Power	720
Faintest Steller Magnitude	14.7
Resolving Power	0.46 Arc - Seconds.
Focuser diameter	2" CNC Machined Crayford Focuser
Eyepiece Standard 1.25"	Premium Plossl 25mm (1.25") 52° field. Premium Plossl 9mm (1.25") 52° field.
Magnification with eyepiece	60.8x
Finder	8x50mm Fully multi-coated achromatic finder
Mount type	DOBSONIAN - wooden base with spring tension.
Mirror Cell	9 points mirror cell
Accessories Tray	INCLUDED
Total Height	63 inch
Tube length	60 inch
Stand height	27 inch
Base diameter	25.5 inch
Shipping Weight	Tube : Net weight - 18 Kg / Gross weight: 20 Kg Stand: Net weight - 13Kg / Gross weight: 15 Kg
Shipping Weight	Tube : 46 x 48 x 155 cm3 Stand: 15 x 74 x 74 cm3

Instructions for use in ENGLISH

Download Instruction Manual of 304/1520 Dobsonian Reflector Telescope in .PDF format.

Free Items [ Subject to Availability ]

• Collimination Tool (for Newtonian)

Suggested Accessories

GSO 2" 2x ED Barlow
₹ 5520

GSO 40mm PLOSSL Eyepiece 1.25"
₹ 3000

SVBONY SV305 Astronomy Camera
₹ 17500