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GSO Dobsonian Telescopes

6inch Night Watch Dobsonian by GSO
D=150mm / F=1200mm Dobsonian F/8 - MADE IN TAIWAN Telescope
24600 + 18% GST
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This Classic 6-inch Dobsonian from Guan Sheng Optics offers high optical performance at a low price. The optical and mechanical quality are without any compromises. This dobsonian is a wonderful beginner telescope.

This telescope is easy operable wth its alt-azimuthal Dobsonian mount. The crisp and contrasty image definition on the other hand will also convince experienced astronomers. Sharpness and image definition are on par with a 120 mm apochromatic refractor costing 6x more. The steel secondary spider vanes are very thin for nearly no diffraction effects.

The telescope is also good for deep-sky. With 6" aperture, you have 78% more light gathering power compared with a standard 4.5" Newtonian. Objects are shown therefore brighter.

  • High quality parabolic optic with 152 mm diameter and 1200 mm focal length.

  • 94% enhanced coating for a brighter image.

  • Very small secondary mirror improves image quality further.

  • Precise 1.25" Crayford focuser for comfortable focusing - ready for 1.25" and T2 accessories.

  • Solid Steel Tube and adjustable mirror cells for perfect collimation and good images.
What's In The Box
  • GSO Dobsonian Telescope
  • Rockerbox - Azimutal Dobsonian Base
  • 6x30 finder with Achromatic Objective
  • 25 mm 1.25" Super Plössl Eyepiece
  • 9 mm 1.25" Super Plössl Eyepiece
  • 1.25" Extension tube
  • Assembly Manual
  • FREE GALAXY Eyepiece 1.25"
  • FREE Carry Bag
  • FREE Solar Filter
Country of Manufacturing TAIWAN
Optical Design
Newtonian Reflecing Telescope
Primary Mirror 6 inch Parabolic 1/12 wave.
Precisely figured parabolic mirror - diffraction limited / BK7
94% enhanced coating
Focal Length 1200mm
Focal Ratio F/8
Highest Practical Power 360
Faintest Steller Magnitude 13.7
Resolving Power
0.74 Arc - Seconds.
Focuser diameter 1.25" Precission Crayford style focuser".
Eyepiece Standard 1.25" Premium Plossl 25mm (1.25") 52° field.
Eyepiece Standard 1.25"
Premium Plossl 9mm (1.25") 52° field.
Magnification with eyepiece 48x & 133.3x
Magnification with eyepiece 40x
6x30mm Fully multi-coated achromatic finder
Mount type
DOBSONIAN- wooden base.
Mirror Cell 3 points mirror cell
Accessories Tray Eyepieces tray
Total Height 52 inch
Tube length 45.25 inch
Stand height 27 inch
Base diameter 20 inch
Shipping Weight
Tube : Net weight - 9 Kg / Gross weight: 11 Kg
Stand: Net weight - 12Kg / Gross weight: 14 Kg
Shipping Carton Dimension Tube : 32 x 40 x 128 cm3
Stand: 14 x 64 x 64 cm3
Buy BAADER Solar Safety Film
Buy 1000 OAKS Solarite Safety Film
Instructions for use in ENGLISH
Download Instruction of GENERAL 150/1200 Dobsonian Reflector Telescope in .PDF format
The following items are FREE with the telescope listed above.
Magnitude 5 Star Atlas
Directional Compass  FREE
Collimination Tool (for Newtonian)
Micro Fiber (Anti-Static) Cleaning cloth
Optics Cleaning Fluid
COLOUR POSTER 17.5"  x 22.5 "  one
110 Messier Object Locator     A4 size front back colour print
109 Deep Sky CALDWELL Catalogue A4 size front back colour print
Star Dial - Identifying Stars & Constellations
Various Astronomical Post-Card (SET-3)
Desiccant Cap - Refillable desiccant cap to protect fine optics
Astronomical Telescope - user guide
The Moon Map Poster B/W chart unfold to 22"x26"
Carry BAG
Galaxy Eyepiece - view hundreds of Galaxy Clusters & Nebulae.
6x30 Finderscope
Powerful 6x30 finderscope, multicoated objective lens. This little telescope will show many objects in direct vision for easy location.
Finderscope Bracket
The 6x30mm finderscope mounts in a quick release bracket that slips into a pre-installed metal mounting shoe nearer the focuser. The bracket is held in place in the mounting shoe by a single large hand-tighten knob that maintains the finder’s collimation, even if the finder is removed between observing sessions. The bracket has two hand-adjust collimation screws that work in conjunction with a third spring-loaded post in the bracket. This makes collimation faster than the traditional three- or six-screw collimation methods used with conventional finder brackets.

Optical Quality
The heart of any telescope is its optics. GSO produces parabolic primary mirrors of very high quality. It is our firm opinion that GSO offers the best astronomical mirrors in this price range. We guarantee a diffraction-limited performance, which essentially means that the performance is limited by observing conditions and the laws of physics.
Primary Mirror
6” (150mm) diameter, 1200mm focal length, f/8 focal ratio with surface accuracy of 1/12 wave. The mirror is made of B270 “water white” optical crown glass that is free of internal stress and striae. B270 glass is equivalent to BK7 in performance and optical quality. The thermal stability of B270 glass is generally better than the soda lime float glass used for the mirrors of most reflectors in this reasonable price range. The mirror is ground and polished under computer control for guaranteed diffraction limited performance, coated with 94% reflectivity aluminum, and overcoated with a protective layer of silicon dioxide (quartz) for long life.
Primary Mirror Cell
Fully adjustable 3-point flotation system metal cell holds the primary mirror. The open frame of the cell allows the mirror to cool down to ambient temperatures quickly, so you can start observing sooner. Large hand-tighten color-coded push-pull collimation and collimation lock knobs make it easy to collimate the primary mirror with no tools required.
Diagonal Mirror
32mm m.a. B270 “water white” optical crown glass, coated with 91% reflectivity aluminum and overcoated with a protective layer of silicon dioxide (quartz) for long life.
Diagonal Mirror Support
Fully adjustable diagonal holder mounted on a low-diffraction four-vane thin spring steel spider.

Two Eyepieces
Fully multicoated Premium plossl eyepiece1.25"
Plossl 25mm 1.25" OD (48x)52° field 
Plossl 9mm 1.25" OD(133x) 52° field

GSO Crayford Focuser

The focuser is the most "visible" part of any telescope with the exception of the optics themselves. You touch the focuser all the time, the focuser is responsible for holding your eyepieces or camera in position and moving them precisely into focus in the first place. This way ultra-precise focus motion is possible for both visual and particularly photographical applications.

The features ::

  • The finest focuser GSO manufacturer has to offer. It is far superior to most classic rack-and-pinion focusers.
  • No image shift when focusing
  • Large load capacity: Up to approx.2.5kgs with a firm friction setting
  • Include 35mm extension tube 1.25" OD

1. Smooth Focusing Action
The Crayford style focusing control makes achieving precise focus for visual observations and astrophotography a breeze and you will experience very smooth and precisely controlled focuser motion with zero backlash and zero image shift.

2. High-Quality Construction and Features
CNC machined from aluminum and anodized black, this focuser comes with a base plate adapter to attach to reflector telescopes. The inner drawtube glides on 4 precision bearings and a roller shaft and provides. The inner barrel is baffled and painted a flat black to minimize reflections for maximum contrast.

3. Tension Adjustment and Focus-Lock
The focuser has two large thumbscrews on the underside. The thumbscrew on the telescope side can be used to lock the focuser, allowing the use of heavy accessories or cameras without fear or slippage or losing focus. The other thumbscrew on the eyepiece end can be used to adjust the tension of the focuser to achieve a focusing "feel" that you like. At the easiest (lightest) setting, the focuser moves extremely smoothly. At tighter settings, you can still use heavier accessories without sacrificing much of the smooth focuser action. GSO's rated load capacity for their Crayford focusers is about 2.5 kgs.

Eyepiece Tray
A standard equipment eyepiece tray attaches to the side of the scope’s altazimuth base. It has cutouts to hold one 2” eyepiece and three 1.25” eyepieces.
Suggested Accessories with this Telescope
  • Baader Solar Filter (off-axis) Germany . . . . Rs. 1200
  • SOLARIX Solar filter (Explore Scienfific - USA) provide more pleasing and natural Yellow-Orange image of the Sun . . . . Rs 1470
  • Azimuth Roller Bearing . . . . Rs 2100
  • GSO 2X Achromatic BARLOW LENS- fully multicoated 1.25" . . . . Rs. 1470
  • ED 3X Barlow Lens GSO 1.25" . . . . Rs. 2640
  • 3 Elememt 2.5x Barlow GSO 1.25"  . . . . Rs. 2370
  • 3 Elememt 5x Barlow GSO . . . . Rs. 2820
  • T-RING Nikon . . . . Rs. 840
  • T-RING Canon . . . . Rs 840
  • T Adapter 1.25" . . . . Rs. 750
  • Super ACHROMATIC (MultiCoated /High Colour corrected) 2X BARLOW 1.25" OD, 2 ELEMENT LENS with T-thread for direct camera attachment /with Brass compression ring / GSO. . . . Rs. 3,000
  • Eyepiece Projection Camera Adapter . . . . Rs. 2100
  • Mobile Cell Phone Adapter . . . . Rs. 1830
  • GSO 1.25" 32mm Camera Projection Lens (CPL) eyepiece ... Rs. 3,900
  • GSO 1.25" 40mm Camera Projection Lens (CPL) eyepiece ... Rs.4,080
  • GSO 2" 30mm Camera Projection Lens (CSV) eyepiece ... Rs.5,700
  • GSO 2" 42mm Camera Projection Lens (CSV) eyepiece ... Rs.5,700

  • Padded Carry Bag for 6 inch Dobsonian OTA . . . . Rs. 1830
  • GSO....0.5X Focal Reducer 1.25" with 25mm extension tube ....Rs 1560
  • GSO Planet View filter each . . . . Rs 660
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