Tejraj Logo
 
STARTRACKER EXPLORE SCIENTIFIC G.S.O. Taiwan i-Optron GoTo Systems BRESSER Germany SKY-WATCHER Telescope with DUAL
AXIS Motor & HPC
SPOTTING SCOPES BINOCULARS EQUATORIAL MOUNTS EYEPIECES & ACCESSORIES CAMERA ADAPTORS OPTICS / KITS FILTERS
 
GSO Dobsonian Telescopes
YOU ARE HERE >> HOME | STARTRACKER SYSTEM | 8" NIGHTWATCH DOB Telescope

STAR TRACKER 8inch Night Watch Dobsonian by GSO
D=203mm / F=1200mm Dobsonian F/6 - MADE IN TAIWAN Telescope
29100 + 18% GST
 
[ click to enlarge ]
 
GSO Write-up Pending
 
TELESCOPE SPECIFICATION
Country of Manufacturing TAIWAN
Optical Design
Newtonian Reflecing Telescope
Primary Mirror 8 inch Parabolid Astronomical Mirror.
Precisely figured Parabolic Mirror - diffraction limited / BK7
94% Enhanced Coating
Diameter
203mm
Focal Length 1200mm
Focal Ratio F/6
Highest Practical Power 480
Faintest Steller Magnitude 14.2
Resolving Power
0.57 Arc - Seconds.
Focuser diameter 2" Precission Crayford style focuser".
With 1.25” eyepiece adapter.
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
Finder
8x50mm Fully multi-coated achromatic finder
Mount type
DOBSONIAN- wooden.
Mirror Cell 3 points mirror cell with cooling fan
Accessories Tray 2 inch Eyepieces tray
Mirror stabiliser Cooling fan for "thermal equilibrium"
Battery-operated primary mirror cooling fan
Total Height 52 inch
Tube length 45.25 inch
Stand height 27 inch
Base diameter 20 inch
Shipping Weight

Tube : Net weight - 11 Kg / Gross weight: 13 Kg
Stand: Net weight - 10Kg / Gross weight: 12 Kg

Shipping Carton Dimension Tube : 32 x 40 x 128 cm3
Stand: 15 x 64 x 64 cm3
 
WARNING
 
Instructions for use in ENGLISH
Download Instruction of GENERAL 203/1200 Dobsonian Reflector Telescope in .PDF format
 
The following items are FREE with the telescope listed above.
Magnitude 5 Star Atlas
Directional Compass  FREE
Starscope Anti-Vibration Pads
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"
 
8x50 Finderscope
Powerful 8x50 finderscope, multicoated objective lens. This little telescope will show many objects in direct vision for easy location.
 
Finderscope Bracket
The 8 x 50mm 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 better 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
8” (203mm) diameter, 1200mm focal length, f/5.9 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 91% reflectivity aluminum, and overcoated with a protective layer of silicon dioxide (quartz) for long life.
Diagonal Mirror
62.5mm 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.
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
47mm 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

Primary Mirror Cooling Fan
A lightweight 4.7” diameter low-vibration cooling fan is built into the mirror cell to assure faster cool-down times. The battery-operated fan is powered by a battery pack that uses eight user-supplied AA batteries and plugs into a jack on the mirror cell frame.
 
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
  • 2" compression ring
  • 2" to 1.25" adaptor with compression ring and 2" filter thread

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.

The 2" focuser barrel features a brass compression ring so your eyepieces and other accessories will not be marred by the set-screw. Also included is a 1.25"-2" adapter with brass compression rings that is threaded to accept standard 2" filters.

The inner draw-tube barrel is anodized black and features a laser-etched scale.

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 3 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
    SOLAR FILTER
  • Baader Solar Filter (off-axis) Germany . . . . Rs. 1560
  • SOLARIX Solar filter (Explore Scienfific - USA) provide more pleasing and natural Yellow-Orange image of the Sun . . . . Rs 1830
    EYEPIECES (Super Premium Plossl for GSO) EYEPIECES (Super Premium Plossl for GSO)
  • 40mm Plossl Eyepiece 1.25" . . . . Rs. 2820
  • 32 mm Plossl Eyepiece 1.25" . . . . Rs 2640
  • 25 mm Plossl Eyepiece 1.25" . . . . Rs. 2550 (include)
  • 20 mm Plossl Eyepiece 1.25" . . . . Rs. 2460
  • 15 mm Plossl Eyepiece 1.25" . . . . Rs. 2280
  • 12 mm Plossl Eyepiece 1.25" . . . . Rs. 2100
  • 9 mm Plossl Eyepiece 1.25" . . . . Rs. 2100 (include)
  • 6 mm Plossl Eyepiece 1.25" . . . . Rs. 2100
  • 4 mm Plossl Eyepiece 1.25" . . . . Rs. 2100
  • GSO SuperView 15mm 1.25" Wide Angle Eyepiece . . . . Rs. 3000
  • GSO SuperView 20mm 1.15" Wide Angle Eyepiece . . . . Rs. 3000
  • GSO SuperView 30mm 2 " Wide Angle Eyepiece . . . . Rs. 4800
  • GSO SuperView 42mm 2" Wide Angle Eyepiece . . . . Rs. 4800
  • GSO SuperView 50mm 2" Wide Angle Eyepiece . . . . Rs. 4800
    BARLOW
  • GSO 2x ED-Barlow-Lens (Multicoated) . . . . Rs.4800
  • 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
    CAMERA ATTACHMENTS
  • 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

  • CARRY BAG
  • Padded Carry Bag for 8 inch Dobsonian OTA . . . . Rs. 2100
  • GSO....0.5X Focal Reducer 1.25" with 25mm extension tube ....Rs 1560
  • GSO.....0.5x Focal Reducer 2 inch ....Rs 2100
  • GSO Planet View filter each . . . . Rs 660
 
 
 
TEJRAJ & CO. ASTRONOMICAL TELESCOPES BINOCULARS OTHER ACCESSORIES
Our Awards
 
 
 

Copyright © 2008 - Tejraj & Co. All Rights Reserved.