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 recommanded 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.
 
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 for OTA
 
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).

TELESCOPE SPECIFICATION

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
Eyepiece 1.25" / 2" OD	OPTIONAL
Barlow Lens	OPTIONAL
Mount type	NO
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

WARNING

This device focuses a lot of light.
Looking directly at the SUN through this device can result in partial or complete loss of vision.
For observing the SUN, we recommend you buy a 'Solar Safety Film' for this Telescope.

Buy 1000 OAKS Solarite Safety Film

Free Items [ Subject to Availability ]

• Collimination Tool (for Newtonian)
• 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
• Astronomical Telescope - User Guide
• The Moon Map Poster B/W chart unfold to 22"x26"
• Magnitude 5 Star Atlas Book

Suggested Accessories

246mm Cap Dia Solar Filter
₹ 3900

Solar Filter for GSO 8" Telescopes
₹ 2400