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AstroQuest Dobsonian Telescope 8-inch aperture with fine Crayford focuser
This Classic 8-inch dobsonian from GSO offers
high optical performance at a low price. The optical and
mechanical quality are without any compromises.
This classic Dobsonian telescope is one of our best-sellers.
8" Aperture are perfect for Moon and Planets but also for
Nebular objects and Galaxies. This telescope is also very
transportable and easy to use - an ideal telescope for beginner!
• High quality parabolic optic with 200 mm diameter and 1200 mm focal length.
• 94% enhanced coating for a brighter image.
• Precise 2" Crayford focuser for comfortable focusing - ready for 1.25" and 2" accessories.
• Solid steel tube and adjustable mirror cells for perfect collimation and good images.
• Main mirror cell and secondary mirror holder - made of metal - fully adjustable
• Upgradeable for astrophotography, binoculars ....
• Cooling fan - reduces the cooling down time of the telescope
Dobsonian Telescopes from GSO. They are often purchased for beginner due to their simplicity and ease of use. Dobsonian telescopes are designed
for visual observing. GSO Dobsonians have better coating and high quality mirrors for maximum sucess and fun under the skies. Its cost/performance
ratio is truly unbeatable.
Excellent Visual Performance: For best possible image quality you need high quality optics as well as optimized mechanics. The GSO Dobsonian
has both. The thin spider vanes improve contrast and image sharpness compared with a simpler spider with thick vanes. 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.
Grab-And-Go Setup: 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!
Primary Mirror Cooling Fan: Until a mirror is properly cooled down it will create
currents of warm air that will deteriorate the image - no matter which mirror substrate
is used. Only after the mirror has cooled down this effect stops. The cooling fan
reduces the cooling down time.
Upgrade your Dobsonian: A Dobsonian telescope from GSO is a perfect starter
telescope. You will get a high end optic for an incredible low price. Later you can
upgrade the telescope with eyepieces, filters or with cradle rings to mount it upon
a parallactic mount. Than you also can start with astrophotography through yor
Newtonian telescope.
Optical performance: The telescope is equipped with high quality GSO mirrors. The selected main mirror is better, than difraction limited. We always make optical
tests on our optical banch to guarantee the high optical level of GSO Newtonians and Dobsonians.
The 2" Crayford Focuser: A central part of the telescope is the good 2" Crayford focuser
with many advantages:
-- Much smoother focus motion compared with simpler focusers.
-- Secure and scratch-free grip on the eyepieces through use of a brass compression ring (both 1.25" and 2")
-- No image shift. This means that the object will remain precisely in position while you focus. Simpler
focusers tend to be shifted a little bit out of alignment, resulting in a relative movement of the object.
This somewhat annoying effect does not occur in the Crayford focuser.
-- No play when you reverse the focusing direction. The focuser will reverse the direction in
which it moves instantaneously when you change the direction in which you turn the focus knobs.
Centering and Tracking Objects with the GSO Classic Dobsonian:
The mount of a Dobsonian telescope is called "Rocker-Box", a fitting name for the uniquely simple and well-working design.
The rocker allows you to point the telescope at any point in the sky and allows for comfortable, intuitive movement. Moving the telescope is very simple, just push the telescope into the right direction ? no need to use clamps or motors, it doesn´t get more simple than this! Since you need to move the Dobsonian manually it is particularly important that the movement be as smooth as possible. The Dobsonian has an azimuth roller bearing for smooth operation.
For the elevation, the telescope is equiped with the Spring Tension System. This prevents the telescope from moving for example when exchanging eyepieces.
Optic: Parabolic main mirror - BK7 optical glass
Aperture: 200 mm - 8"
Focal Length: 1200 mm
Obstruction: 25% linear Focal Ratio: f/6
Collimating help: Center mark on the main mirror Secondary Mirror: 50 mm diameter
Focuser:  2" Crayford focuser with 1.25" reducer
Tube:  Steel tube
Tube weight: 13 kg
Tube length:  1150 mm
Tube diameter:  230 mm
Rockerbox mount weight:  10.2 kg
Rockerbox mount dimensions: Height 600 mm / Diameter 500 mm
Movement:  Elevation Spring Tension System/ Azimut Roller Bearing System
Weight of complete telescope:  23.2 kg
Eyepiece: 25 mm 1.25" Super Plössl eyepiece
ข้อดีกว่าคือมีพัดลมระบายความร้อนและระบบโฟกัสแบบ Crayford focuser
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