Sky-Watcher 8" f/6 Flextube Dobsonian Telescope
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Sky-Watcher 8" f/5.9 Flextube Dobsonian Telescope
The Sky-Watcher 8" f/5.9 Flextube Dobsonian Telescope is a low cost, large aperture reflecting telescope of the Dobsonian design. It is an ideal telescope for wide-field, deep-space observation of faint galaxies, nebulae, and star clusters. The low-power dramatically captures wide swaths of sky in a single view. Galaxies and nebula appear to pop out of the heavens as bright, expansive masses of stars, gas, and dust.
Observing with the 8" Sky-Watcher Dobsonian:
If you have never before observed through a high-quality, wide-field Dobsonian, like the Sky-Watcher 8" DOB, you are in for one of the sweetest experiences in amateur astronomy. Some of amateur astronomy's most revered and enthusiastically observed extra solar-system objects are now within your reach. Observing with a Dobsonian has been described akin to shooting ducks in a gallery because it is so easy to find your target. Just swing your Sky-Watcher DOB to the quadrant of sky to be searched, and scan the vicinity. An 8x50 mm optical viewfinder helps your search for those elusive fuzzies when star-hopping. At low power, deep-space objects leisurely drift through the field of the Sky-Watcher 8" DOB, so constant mechanical adjustment of the telescope's orientation isn't needed to keep objects in the field of view.
The standard-equipment backlash-free 2" Crayford Focuser insures ultra smooth focusing adjustments. Multi-coated, 4-element Plossl eyepieces (20 mm and 12.5 mm) provide a spacious 70 degree Apparent Field of View. To ensure mechanical ease-of-use, Sky-Watcher uses a high-performance Teflon bearing system in both axes combined with tension adjustment in altitude to facilitate setting the appropriate amount of friction, assuring smooth vertical and horizontal manual movement without free-play from small bumps or gusts of wind. This also eliminates the need to have a balanced optical tube as in an equatorial mount.
Sky-Watcher's revolutionary truss-support concept allows the optical tube's front and back cells to collapse together, aligning on the truss support rods which can then be locked down for easy and secure telescope transport. This innovation provides a one piece, low-hassle OTA design, mechanically simple and results in large aperture telescopes that can be reasonably handled and transported by one individual.
Sky-Watcher Uses Quality Components Throughout:
The polishing process for primary and diagonal mirror yields smooth mirror surfaces ensuring good contrast, and properly corrected optics show minimum alterations to the optical wave-front. On each primary mirror, and elliptical diagonal mirror aluminum is vacuum deposited to the front glass surface and then over coated with hard quartz (SiO4). Additional layers of Titanium Dioxide (TiO2) and (SiO4) are then applied. Dust covers help keep your DOB clean when not in use. The mechanical and structural components of the OTA exhibit rigid construction and outstanding stability. Mount design, while simple, facilitates smooth motions about both axes. Quality accessories enhance your viewing experience.
In order to achieve focus while using a binoviewer without a corrector or Barlow lens, these Sky-Watcher Collapsible Truss Tube Dobsonians have an additional set of holes to allow the diagonal mirror cage to be lowered to a predetermined locking position on the truss poles. This enables binoviewing without unnecessary excess magnification.
SKU Number
|
SKY-S11700 |
---|---|
Model Number
|
S11700 |
Telescope Series
|
Sky-Watcher Flextube Dobsonian |
Focal Ratio
|
f/5.9 |
Optical Design
|
Newtonian Reflector |
Telescope Aperture
|
203mm (7.99") |
Telescope Mount Type
|
Dobsonian |
Type of Electronics
|
Manual - No Electronics |
Focal Length (mm)
|
1200 |
Optical Coatings
|
Aluminum with multi-overcoats |
Limiting Stellar Magnitude
|
14 |
Lowest Useful Magnification
|
29x |
Highest Useful Magnification
|
472x |
Light-Gathering Power Compared to Human Eye
|
816x |
Focuser Style
|
Crayford/Crayford Style |
Focuser Size
|
2" |
Focuser Speed
|
Single Speed |
Eyepiece Height at Zenith (in.)
|
44.5 |
Telescope Outer Diameter (in.)
|
9.375 |
Telescope OTA Weight (lb.)
|
24.2 |
Dobsonian Base Weight (lb.)
|
26 |
Refractor OTA Length - Extended (in.)
|
44 |
Refractor OTA Length - Retracted (in.)
|
33 |
Dobsonian Base Dimensions (in.)
|
29.5 x 20 |
Warranty
Warranty
Manufacturer's warranty period, if known. Customers should communicate directly with the manufacturer regarding details of their warranty, as warranties have a tendency to change without notice.
|
Sky-Watcher 2 Year Limited |
- Sky-Watcher 8" f/6 Flextube Dobsonian Reflector Telescope
- Solid Dobsonian Rocker Mount
- Collapsible Truss-Tube Structure
- 8x50 Right Angle Erect-Image Finderscope
- 2" Crayford-Style Focuser with 1.25" Adapter
- 20 mm Super Plossl Eyepiece - 1.25"
- 12.5 mm Super Plossl Eyepiece - 1.25"
- 1.25" and 2" Eyepiece Adapters
- Dust Covers
Recommended Accessories

Astrozap Light Shroud for 8" Sky-Watcher Flex Tube...
While it is perfectly fine to use a Truss Tube style telescope without a shroud, it is nice to have one, especially when observing from a site with light sources that may enter the system and lower contrast. Think headlights, flashlights, porch lights, etc. This shroud is made by Astrozap for the 8” Flextube Dob is a perfect fit.

Apertura 15mm Super Wide Angle 1.25" Eyepiece
The Apertura 15 mm SWA eyepiece will produce 80X magnification when used in the Skywatcher 8” Dob. If you also pick up a 2X Barlow, you’d be able to double the magnification of the 15 mm to 160X, a nice high power choice for this scope on nights of good seeing.

Apertura 2x 1.25" Barlow
A 2X Barlow is one of the most popular telescope accessories available because it doubles the magnification of any 1.25” eyepiece you use with it! Grow your magnification choices quickly by adding a good 2X Barlow to your accessory case. This telescope comes with a 25 mm & 10 mm eyepiece, for 48X & 120X magnification, respectively. Double the power to 96X & 240X (respectively) by adding a Barlow to the mix, and for every eyepiece you buy thereafter, you‘ll have two magnification options instead of one!

Apertura 1.25" Moon Filter
You won't believe how bright the moon is through a telescope! A Moon Filter will dim the light, just like sunglasses do, so you can see more details on the lunar surface. The moon filter threads onto the barrel of all included eyepieces and any other astronomy accessory you buy later that has a 1.25” barrel.

Celestron Sky Maps and Planisphere
This water resistant sky map does double duty! On the front is a northern hemisphere planisphere that rotates so you can figure out what constellations are up for a specific date and time. Inside are seasonal star maps that display where bright stars and celestial objects are located, with info broken down by constellation. Recommended for anyone who wants to know what's up in the sky at any given time, this guide will serve you well for many years to come!

Apertura Astro Vision Red LED Flashlight
A red flashlight keeps your eyes dark-adapted for the best views! Use it to read star charts, look for accessories, or get around in the dark. A must for any amateur astronomer!

Telrad Reflex Sight Finder
Dob owners love the Telrad for its low profile, zero magnification bullseye that helps amateur astronomers “star hop” from one cool object to the next when using a star map or planisphere. Even if you have an optical finder with magnification (like this telescope), you will still enjoy the simplicity of the Telrad!

Apertura 1.25" Laser Collimator with 45-deg A...
Keep the optics of your Dobsonian properly aligned with this easy to use laser collimator. A few tweaks to your optics will assure the sharpest views! The perfect tool for the maintenance of any reflecting telescope.