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Description
Sky-Watcher S11720 Overview
Enjoy the wonders of the night sky with the Sky-Watcher Flextube 250P 10" Collapsible Dobsonian Telescope. This reflector-style Dob offers a generous 10" aperture and 1200mm focal length for dazzling views of planets, the moon, nebulae, galaxies, and more. The optical tube assembly is mounted on a floor base with Teflon bearings for smooth, easy slewing and Sky-Watcher's patented Tension Control Handle, which keeps the telescope locked onto whichever celestial object you've chosen to observe on a given evening. The OTA's collapsible design makes the telescope easier to transport and store.
The Sky-Watcher Flextube 250P 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 31.5" for easier transport and storage, and then extends to 44" for observation.
The large 10" aperture draws in copious amounts of light to resolve deep-sky objects like wispy nebulae and galaxies, while also revealing incredible details of the lunar surface and planetary features. Included are 10 and 25mm 1.25" eyepieces, but the focuser comes with an adapter allowing 2" eyepieces to be used.
- Large 10" aperture is able to resolve dim deep-space objects like wispy nebulae and galaxies
- Fast f/4.7 focal ratio ensures a wide field of view, maximum light throughput
- Long 1200mm focal length helps to produce fast focal ratio and moderate magnification potential
- Collapsible truss system saves space during transport and storage, measuring just 31.5" 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: 0.46 arcsec (Dawes Limit), 0.55 arcsec (Rayleigh Limit)
- 64mm secondary diameter mirror; Obstruction: 25% by diameter, 6% by area
- 48" eyepiece height when aimed directly overhead at the zenith
- 11.375" (23.81cm) outside tube diameter
- Crayford-style is much more precise than the traditional rack-and-pinion focuser
- 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
- 1.25" diameter nosepiece accepts most standard filters
- 25mm focal length eyepiece produces 48x 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 8x 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
Featuring Teflon bearings for smooth slewing and a patented tension control to lock in on the target of your observation, the Sky-Watcher 10" 10" Collapsible Dobsonian Base makes it easy to aim your compatible optical tube assembly. The base assembly is outfitted with Sky-Watcher's proprietary Tension Control Handle to increase or decrease the friction between the optical tube and sideboards. This floor-based mount measures 29.5 x 20" and weighs 26.5 pounds.
- Tension Control Handle allows users to add or reduce tension, increasing or decreasing the friction between the optical tube and the sideboards
- Teflon bearings for smooth, easy slewing
- Dimensions: 29.5 x 20"
- Weight: 26.5 pounds
In the Box
- Sky-Watcher Flextube 250P 10" Collapsible Dobsonian Optical Tube Assembly
- 8x50 Finderscope
- 10mm Super Eyepiece
- 25mm Super Eyepiece
- 2-to-1.25" Eyepiece Adapter
- Sky-Watcher 10" Collapsible Dobsonian Base
Sky-Watcher Flextube 250P 10" Collapsible Dobsonian Optical Tube Assembly Specs
| Optical Design | Dobsonian Reflector |
| Aperture | 254 mm / 10" |
| Focal Length | 1200 mm |
| Focal Ratio | f/4.7 |
| Resolution | 0.46 Arcsec (Dawes) 0.55 Arcsec (Rayleigh) |
| Focuser | Crayford |
| Eyepiece Barrel Diameter | 1.25", 2" |
| Diagonal | None |
| Finderscope | Yes |
| Optical Tube Dimensions | Length: 31.5" / 80 cm Retracted Length: 44" / 111.8 cm Extended |
| Wi-Fi | No |
| Weight | 33 lb / 15 kg (OTA) |
| Package Weight | 40.6 lb |
| Box Dimensions (LxWxH) | 37 x 18 x 17.5" |
Sky-Watcher 10" Collapsible Dobsonian Base Specs
| Mount Type | Manual; Alt-Azimuth |
| GoTo Capability | No |
| Motor | None |
| Polar Axis Scope | None |
| Ports | None |
| GPS | No |
| Wi-Fi | No |
| Dimensions | 29.5 x 20" / 74.9 x 50.8 cm |
| Weight | 26.5 lb / 12 kg |
| Package Weight | 31.1 lb |
| Box Dimensions (LxWxH) | 30.25 x 6 x 4.25" |
Sky-Watcher S11720 Reviews
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Bulk Discount
| Quantity | Price |
| 2 | ₹ 151684.4 |
| 3-5 | ₹ 150136.6 |
| 5-10 | ₹ 147041.0 |
| 10+ | ₹ 143945.4 |
Bulk discount will be automatically applied during checkout based on quantity.