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Description
Sky-Watcher S11800 Overview
The Sky-Watcher Flextube 8" f/6 Collapsible GoTo Dobsonian Telescope is built for ease of use and convenience, allowing even beginner astronomers to enjoy the wonders of the universe. Unlike traditional rigid-tube Dobsonians, the Flextube disassembles into just two pieces: The optical tube and the base mount. This makes transporting and setting up the telescope fast and easy.
Sky-Watcher Flextube 8" f/6 GoTo Collapsible Dobsonian Optical Tube Assembly
Sporting the large light bucket users have come to expect from a Dob, the Sky-Watcher Flextube 8" f/6 GoTo Collapsible Dobsonian Optical Tube Assembly gives users great performance at a reasonable price. Its large parabolic Borosilicate primary mirror is treated with a combination of quartz, titanium, and silicon dioxide that brings its reflectivity to over 94%, with a secondary mirror obstruction of just 6% by area. Unlike traditional Dobsonians that tend to be bulky and unwieldy, the Flextube's patented truss design allows it to retract to just 33" for easier transport and storage, and then extends to 44" for observation.
The large 8" aperture draws in copious amounts of light to resolve awe-inspiring deep-sky objects like wispy nebulae and galaxies, while also revealing incredible details of the lunar surface and planetary features. Its fast f/6 focal ratio and Crayford focuser makes this an ideal choice for imaging. The fast focal ratio enables devices to capture images in less time than slower scopes, while the focusing mechanism gives it the ability to achieve tack-sharp focusing with zero backlash that rack-and-pinion focusers are generally unable to. This 2" focuser will accept larger eyepieces so users can enjoy a truly immersive visual experience and will ensure larger imaging sensors are completely covered. For convenience, Sky-Watcher includes a reducer adapter that will allow you to use the more common 1.25" eyepieces.
Optical Tube Assembly
- Large 8" (203mm) aperture is able to resolve dim deep-space objects like wispy nebulae and galaxies
- Fast f/5.9 focal ratio ensures a wide field of view, maximum light throughput
- For astrophotography the fast focal ratio will result in shorter exposure times versus "slower" OTAs while achieving similar results
- Long 1200mm focal length helps to produce the fast focal ratio and moderate magnification potential
- Collapsible truss system saves space during transport and storage, measuring just 33" when trusses are retracted and extending to 44" when set up
- Borosilicate parabolic primary mirror
- Quartz, titanium, and silicon dioxide mirror coatings bring the reflectivity to 94%
- Resolution: 0.57 arcsec (Dawes Limit), 0.69 arcsec (Rayleigh Limit)
- 48mm secondary diameter mirror; Obstruction: 24% by diameter, 6% by area
- 47" eyepiece height when aimed directly overhead at the zenith
- 9.375" (23.81cm) outside tube diameter
Focuser
- Crayford-style is much more precise than the traditional rack-and-pinion
- Tension control system eliminates gears, resulting in zero backlash for tack-sharp focus on dim objects or objects, like binary stars, that are close together
- 2" diameter holder allows the use of larger eyepieces and imaging systems that provide a wide field of view and long eye relief to make viewing dim and small deep-sky objects more comfortable
Included Accessories
- 1.25" diameter nosepiece accepts most standard filters
- 25mm focal length eyepiece produces a low 25x magnification for wide-field observations, alignment, and viewing lunar surface details
- 10mm focal length eyepiece yields a high 120x power to make detailed observations of specific portions of the sky or for planetary viewing
- 2-to-1.25" reducer allows the use of the more common size eyepieces and accessories
- Low 9x power produces a wide field of view for accurate alignment
- 50mm objective allows users to see dimmer stars for more options during 2-star alignment
- Mounting bracket included
Sky-Watcher 8" GoTo Collapsible Dobsonian Base Assembly
Updated with a Wi-Fi module for wireless control though a smartphone app, the Sky-Watcher 8" GoTo Collapsible Dobsonian Base Assembly is outfitted with dual-axis DC servo motors. When used with the SynScan app or included SynScan hand controller, gives you full GoTo capabilities with multiple tracking rates for near and deep-sky objects, slew speeds from 1x to 1000x, and assisted alignment procedures. The SynScan system has a database of over 42,900 objects with a guided tour option that will show you best objects to see based on your location and the date & time you're observing.
SynScan Control
- Built-in Wi-Fi module allows the use of the SynScan smartphone app to control the base
- App available for Apple and Android devices
- Wired hand controller, powered by the mount, provides all the same functionalities as the app
- User-friendly menu system
- Up to 5 arc min GoTo pointing accuracy
- Brightest-Star and Two-Star assisted alignment procedures
- Sidereal, lunar, solar tracking rates
- 1x, 2x, 8x, 16x, 32x, 200x, 400x, 600x, 800x, 1000x slew speeds
Database
- 42,900 objects including planets, nebulae, star clusters, and galaxies
- Tour of the night sky based on location, date, and time
- 25 user-defined objects
- Includes the complete Messier, NGC, and IC catalogs; and partial SAO catalog
Base Details
- Dual axis DC servo motors with encoders
- Dual encoder design keeps track of where the scope is being moved, allowing the telescope to be moved manually without the need for re-alignment�1,620,000 counts per revolution, main axis encoder: 11,748 counts per revolution
- Tension Control Handle allows users to add or reduce tension, increasing or decreasing the friction between the optical tube and the sideboards
- Included 10-15 VDC 1A power supply
- Dimensions: 30 x 20"
- Weight: 33 pounds
In the Box
- Sky-Watcher Flextube 8" f/6 GoTo Collapsible Dobsonian Optical Tube Assembly
- 9x50 Finderscope
- 10mm Super Eyepiece
- 25mm Super Eyepiece
- 2-to-1.25" Eyepiece Adapter
- Limited 2-Year Warranty
- Sky-Watcher 8" GoTo Collapsible Dobsonian Base Assembly
- SynScan Controller
- SynScan Controller Cable
- 12 VDC Power Supply
- Limited 2-Year Warranty
Sky-Watcher Flextube 8" f/6 GoTo Collapsible Dobsonian Optical Tube Assembly Specs
| Optical Design | Dobsonian Reflector |
| Aperture | 203 mm / 8" |
| Focal Length | 1200 mm |
| Focal Ratio | f/5.9 |
| Resolution | 0.57 Arcsec (Dawes) 0.69 Arcsec (Rayleigh) |
| Focuser | Crayford |
| Eyepiece Barrel Diameter | 1.25", 2" |
| Diagonal | None |
| Finderscope | Yes |
| Optical Tube Dimensions | Length: 33" / 83.8 cm Retracted Length: 44" / 111.8 cm Extended |
| Wi-Fi | No |
| Weight | 24.2 lb / 11 kg (OTA) |
| Package Weight | 31 lb |
| Box Dimensions (LxWxH) | 35 x 18 x 15" |
Sky-Watcher 8" GoTo Collapsible Dobsonian Base Assembly Specs
| Mount Type | Motorized; Alt-Azimuth |
| GoTo Capability | Yes, SynScan |
| Motor | Dual Axis |
| Tracking Rates | Lunar, Sidereal, Solar |
| Polar Axis Scope | None |
| Adapter | 12 VDC (Included) |
| GPS | No |
| Wi-Fi | Yes |
| Dimensions | 30 x 20" / 76.2 x 50.8 cm |
| Weight | 33 lb / 15 kg |
| Package Weight | 49 lb |
| Box Dimensions (LxWxH) | 35.2 x 31 x 22.8" |
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Bulk Discount
| Quantity | Price |
| 2 | ₹ 265893.6 |
| 3-5 | ₹ 263180.4 |
| 5-10 | ₹ 257754.0 |
| 10+ | ₹ 252327.6 |
Bulk discount will be automatically applied during checkout based on quantity.