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STARTRACKER
[ India ]
EXPLORE SCIENTIFIC
[ U.S.A. ]
G.S.O.
[ Taiwan ]
i-Optron GoTo
[ U.S.A. ]
BRESSER
[ Germany ]
ORION
[ U.S.A. ]
William Optics
[ Taiwan ]
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GSO Imaging Newtonian Telescopes
YOU ARE HERE >> HOME | Telescopes with Motor & GoTo| GSO 8" F/4 on EXOS-II Dual Axis Motor

GSO 8inch F/4 Imaging Newtonian Telescope with EXOS-II Dual Axis Motor & HPC
D=200mm / F=800mm F/4 Astrophotography Telescope | MADE IN TAIWAN (OTA)
80400 + 18% GST
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Rossete Nebula Needle Galaxy NGC 4565
Witches Broom NGC9660  

Whats App Message
8" f/4 Imaging Newtonian telescope - for astro photography and rich field observation
  • fast and diffraction limited reflector system (f/4)
  • high definition parabolical primary mirror, better than typical Chinese mirrors
  • bright image by forced 94% mirror coatings
  • good field illumination by 70mm secondary mirror
  • robust mechanical system, no tilting/bending even under heavy camera load
  • improved Monorail focuser with 1:10 dual speed transmission - more stability compared with Crayford designs 
  • ideal for travelling: tube length only 58 cm, weight only 6 kgs with rings and finderscope.
  • GSO 8" f/4 Newtonian telescope is a strongly recommended combination for astro photography as well as visual observing. We also offer high quality coma correctors for this fast imaging newtonian telescope.
 
Fast and Precision Optics
The precisely figured 8" f/4 primary mirror is made from BK7 optical glass for enhanced thermal stability. BK7 is far superior in thermal characteristics to soda lime float glass - the glass used in consumer products like cookware - that's used in many reflectors in this price range. The mirror is coated with enhanced aluminum to at least 92% reflectivity and coated with a protective layer of SiO2 (quartz) for durability. The primary mirror is mounted in a cell with six external push-pull collimation knobs on the back of the tube, and the center-marked primary makes collimation with a laser a snap.

With a cropped-sensor DSLR camera or an astronomy camera such as the ZWO ASI071MC-Pro with an APS-C sensor, this scope gives a field of view across the diagonal of nearly 2 degrees, more than enough to frame the brightest regions of extended deep-sky objects like the Andromeda and Triangulum galaxies, the Orion Nebula, and the Horsehead Nebula.
 
BRESSER EXOS-II Dual Motor EQ Mount
Mount and Tripod. The BRESSER EXOS 2 is a rugged mount with high rigidity and precision tracking for visual observation and astrophotography. The tripod is extremely rigid to suppress vibrations really well. This model is very well machined and has a polar finder scope and precise graduated circles. A powered twoaxis control (BRESSER Exos Duo) or a GoTo-Kit is available as an optional extra. The BRESSER EXOS 2 can take the weight - depending on length and use of up to 13 kg. This allows you to use refractors of up to 152 mm aperture and mirror telescopes of up to 203 mm aperture.
  • The BRESSER EXOS 2 is a rugged equatorial mount with high rigidity and precision tracking for visual observation and astrophotography
  • The tripod is extremely rigid to suppress vibrations really well. This model is very well machined and has polar finder scope and precise graduated circles.
  • A powered two axis control (BRESSER Exos Duo) or a GoTo-Kit is available as an optional extra.
  • The BRESSER EXOS 2 can take the weight - depending on length and use of the telescope of up to 13 kg
  • Included: Mount, height adjustable tripod, 2x flexible shaft, polar finder scope, 4.5 Kilogram counterweight
 
BRESSER EXOS-II Mount Special Features
  • weight EXOS II Goto: 4.5kg (without counterweight shaft, which weights 1.0kg)
  • load capacity: 13kg
  • weight Tripod: 4.9kg
  • maximum height tripod: 108cm
 
BRESSER RA/DEC-Motor Kit Duo for EXOS-2 and EQ/MON-2
This Bresser Messier RA+DEC-Motor + Controller MON2 lets you control your Messier telescope more comfortably. Including controller. Suitable for Bresser Messier telescopes or mount with Exos-2 or Mon-2 equatorial mount.

Motorkit for both axes (RA und DEC). Handcontrol with 3 preset speeds (1x (sidereal speed); 8x; 32x). Suitable for entry level astrophotography.
 
What's in the Box
  • 200mm f/4 Newtonian optical tube assembly
  • 2" Crayford-style linear bearing focuser with 1.25" eyepiece adapter
  • 8x50mm straight-through finder with bracket and base
  • Tube rings
  • 8" Vixen-style dovetail rail
  • 2" extension tube with 35mm extension
  • Front dust cover
  • No instruction manual is included at this time (coming soon)
  • EXOS II Mount
  • Height Adjustable Tripod
  • 2x flexible shaft
  • Polar Finder Scope
  • 4.5 kg Counterweight
  • Stepping motor for RA- and DEC axis
  • Mounting material and clutches
  • Handcontrol
 
The high-quality 2" Crayford focuser
The 2" Crayford focuser with 1:10 speed reduction is included. Accessories are evenly clamped with a brass compresssion ring. The 1.25" reducer is equipped with a brass ring, too. The focuser will not wobble even when used with heavy cameras. With the 1:10 speed reduction, precise focusing is possible. Point-shaped stars over the whole field are the result.
 
Tube and Mounting Rings

The tube of this imaging Newtonian is made from rolled steel for good thermal stability and it's capped with end rings of die-cut aluminum for protection and rigidity. It includes a dust cap. The scope also comes with two split-hinged die-cast aluminum mounting rings with felt lining to protect the finish of the tube. These rings make it easy to rotate the tube to bring the focuser and finder to the most comfortable viewing position. The bottoms of the rings have threaded mounting holes for a Vixen-style mounting plate (which is included) or an optional Losmandy-style plate. The tops of the two rings each have two threaded M6x25mm holes that are 7.5" apart so you can install a separate dovetail to mount other accessories such as a guide scope.

The tube has an attractive outside gloss white finish and a matte black interior finish to reduce stray reflection and increase image contrast. The tube is 9.15" in diameter (9.3" at the end rings), 27.75" long, and it extends beyond the focuser to act as a shield to prevent stray light from entering the tube and reducing image contrast. The primary mirror cell also includes a low noise, long-lifetime cooling fan powered by 8 AA batteries (batteries not included).

 
GSO 6" F/4 Telescope SPECIFICATION
Country of Manufacturing TAIWAN
Optical Design Fast Newtonian
Primary Mirror 200 mm Primary Mirror 94% reflectivity dielectrically coated/minimum 1/12th wave, BaK7 glass
Focal Length 800 mm
Focal ratio f/4
Highest Practical power  
Faintest Steller Magnitude  
Finder 8x50 Fully multi-coated achromatic finder with quick-release bracket
Focuser 2" Monorail with 1:10 dual speed transmission and reducer to 1.25", brass compression ring, with 2" extension tube - to achieve focus with all kinds of eyepieces
Accepts Eyepiece Barrel Ø 50.8mm (2") to 31.7mm(1.25")
Mirror Cell Primary mirror Cell with 12V Main mirror cooling fan
Secondary Mirror 00 mm minor Axis
Standard Eyepiece(s) Your choice of any two GSO Premium Plossl Eyepiece 1.25''
any one from series:: 12mm / 9mm / 6mm / 4mm
any one from series:: 15mm / 20mm / 25mm / 32mm
[ subject to availability in choices ]
Barlow Lens OPTIONAL
Mount type German Equatorial
Astro-imaging capability Lunar Planetary & Deep Sky
Mounting Ring Two mounting ring
Dove tail Bar system Yes
Tube material Steel
Tube dimension length 720 mm / diameter 240mm
Weight, optical tube 9 kg including mounting ring and 6x30 finder
Shipping Weight OTA
Tube : Net weight - 9 Kg / Gross weight: 12 Kg
Shipping Cartoon Dimension 200/F4 OTA 86 x 42 x 34 cm3
EXOS-II GENERAL TECHNICAL DATA
Colour white
Material Metal
Product series Messier
EXOS-II DIMENSIONS & WEIGHTS
Net weight
(without access.)
4500 g
Net Weight total
(incl. accessories)
14500 g
Net weight tripod
(incl. accessories)
4.9 kg
Shipping Weight 20 kg approx
DIMENSIONS & WEIGHTS of RA Motor
Total length 65 mm
Total width 55 mm
Total height 54 mm
Net Weight total (incl. accessories) 1440 g
1]  Operation alternatively with a suitable power supply (included). Only use a power supply as indicated on the device / in the manual.

2] Operating voltage: 12V DC Connection power supply: DC- plug 5.5/2.5mm Polarity of the 12V connection socket: pin inside + / plug shaft unit.
 
Instructions for use in ENGLISH
Bresser Operating Manual
 
WARNING
Buy BAADER Solar Safety Film
Buy 1000 OAKS Solarite Safety Film
 
The following items are FREE with the telescope listed above. [ Subject To Availability ]
Magnitude 5 STAR Atlas
Directional Compass  FREE - NOT IN STOCK
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"
 
Suggested Accessories with this Telescope
    SOLAR FILTER
  • SOLARIX Solar filter (Explore Scienfific - USA) provide more pleasing and natural Yellow-Orange image of the Sun . . . . Rs 1920
    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
  • 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
  • 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
    FINDER
  • GSO 8x50 RA finder . . . . 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. 930
  • T-RING Canon . . . . Rs 930
  • 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
  • 2 inch T-2 Camera Adapter . . . . Rs 1650
  • GSO 40mm Camera adapter 2 inch . . . . Rs. 1560
  • Eyepiece Projection Camera Adapter . . . . Rs. 2100
  • Mobile Cell Phone Adapter . . . . Rs. 1560
  • GSO 1.25" 32mm Camera Projection Lens (CPL) eyepiece ... Rs. 3900
  • GSO 1.25" 40mm Camera Projection Lens (CPL) eyepiece ... Rs.4080
  • GSO 2" 30mm Camera Projection Lens (CSV) eyepiece ... Rs.5700
  • GSO 2" 42mm Camera Projection Lens (CSV) eyepiece ... Rs.5700
  • COMA Corrector 2 inch . . . . Rs 5700
  • 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
  • GSO 2 inch EXTENSION TUBE
    35mm . . . . Rs 1470
    50mm . . . . Rs 1560
    80mm . . . . Rs 1650
  • 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
 
 
 
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