Sky-Watcher Flextube 300P 12" Collapsible Dobsonian Telescope Kit

BH #SKSW12DOBK • MFR #S11740
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Sky-Watcher Flextube 300P 12" Collapsible Dobsonian Telescope Kit
Key Features
  • 12" Dobsonian-Style Reflector
  • Space-Saving Collapsible Tube Design
  • 1500mm Focal Length, f/4.9 Focal Ratio
  • Highly Reflective Borosilicate Mirror
The Sky-Watcher Flextube 300P 12" Collapsible Dobsonian Telescope Kit is perfect for visual observation of nebulae, star clusters, and galaxies, along with the moon and planets. The optical tube assembly collapses to 36" for storage and transport, and expands to 55" for use. Its mirror produces high reflectivity and the 12" aperture collects 1840 times more light than the human eye. The OTA is supported by a base with Teflon bearings and a tension control handle for smooth, precise operation.
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Kit Contains:

The Sky-Watcher Flextube 300P 12" Collapsible Dobsonian Telescope Kit is perfect for visual observation of nebulae, star clusters, and galaxies, along with the moon and planets. The optical tube assembly collapses to 36" for storage and transport, and expands to 55" for use. Its mirror produces high reflectivity and the 12" aperture collects 1840 times more light than the human eye. The OTA is supported by a base with Teflon bearings and a tension control handle for smooth, precise operation.

Sky-Watcher Flextube 300P 12" Collapsible Dobsonian Optical Tube Assembly

The Sky-Watcher Flextube 300P 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 94%, with a secondary mirror obstruction of just 5% by area. Unlike traditional Dobsonians that tend to be bulky and unwieldy, the Flextube's patented truss design allows it to retract to just 36" for easier transport and storage, and then extends to 55" for observation.

The large 12" 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.

Optical Tube Assembly
  • Large 12" aperture is able to resolve dim deep-space objects like wispy nebulae and galaxies
  • Fast f/4.9 focal ratio ensures a wide field of view, maximum light throughput
  • Long 1500mm focal length helps to produce fast focal ratio and moderate magnification potential
  • Collapsible truss system saves space during transport and storage, measuring just 36" when trusses are retracted and extending to 55" when set up
  • Borosilicate parabolic primary mirror
  • Quartz, titanium, and silicon dioxide mirror coatings bring the reflectivity to 94%
  • Resolution: 0.38 arcsec (Dawes Limit), 0.46 arcsec (Rayleigh Limit)
  • 70mm secondary diameter mirror; Obstruction: 23% by diameter, 5% by area
  • 55.5" eyepiece height when aimed directly overhead at the zenith
  • 14.25" (23.81cm) outside tube diameter
UPC: 050234174015
Sky-Watcher Flextube 300P Dobsonian Base

The Flextube 300P Dobsonian Base supports the Sky-Watcher 300P Collapsible Dobsonian Optical Tube Assembly. The base uses Teflon bearings for smooth, easy Azimuth slewing and a patented tension control handle to lock the telescope in place.

UPC: 050234740111

Sky-Watcher S11740-1 Specs

Key Specs
Aperture
305 mm / 12"
Focal Length
1500 mm
Focal Ratio
f/4.9
Eyepiece
Yes, Removeable: 2" Diameter (1.25" Adapter Included) with 90° Diagonal
Optical Design
Dobsonian Reflector
Aperture
305 mm / 12"
Focal Length
1500 mm
Focal Ratio
f/4.9
Resolution
0.38 Arcsec (Dawes)
0.46 Arcsec (Rayleigh)
Focuser
Crayford
Eyepiece
Yes, Removeable: 2" Diameter (1.25" Adapter Included) with 90° Diagonal
Finderscope
Yes
Optical Tube Dimensions
36 x 14.3" / 91.4 x 36.3 cm (Retracted)
55 x 14.3" / 139.7 x 36.3 cm
Packaging Info
Package Weight
56.18 lb
Box Dimensions (LxWxH)
41 x 21.25 x 20.75"

Sky-Watcher S11740-1 Reviews

Awesome scope, good customer service

By Lawrence
Rated 5 out of 5
Date: 2023-01-02

I have been watching the stars for nearly 5 decades now and have very slowly progressed through several backyard scopes along the way, 2 and 4 inch refractors, then my first Dobsonian back in '06, that 6 inch Dob lasted me just fine until this year, when fortunate circumstances allowed me the time, space, and money to go bigger. I am glad I did. So first of all B&H actually had this in stock, most other sites were out of stock on this and other comparable scopes of different brands. A B&H rep called me prior to shipping to confirm the order and delivery dates. It arrived less than a week later in 2 deliveries (base, then scope the next day). assembly was not difficult at all, instructions were straightforward and clear. took me about 40 min. and I go really slow...The mirrors were actually pretty close to alignment out of the box, but I did not get the scope perfectly collimated (I still need to get the proper wrenches for the secondary mirror) but I managed to get it fairly close, as the primary mirror is very easy to adjust. Then it was a wait for the weather to clear, and I FINALLY caught first light 3 wks later on new year's eve, we only had a few cloudbreaks but managed to get excellent (yet brief) views of a nice half moon and a really quick 5 minutes of Jupiter and the 4 Galilean moons, Jupiter's atmospheric bands crisp and clearly visible with a 25 mm eyepiece. I was not able to cycle through all my lenses due to weather and the new years party, but what we did manage to see with the included 25 mm was simply stunning, I can not wait for good weather to return, the collapsible design allows me to get the scope and base in the car and so far I am really impressed with the overall quality and performance of this scope, no buyer's remorse here, this is a hands-down 5 star review.

See any errors on this page?

Does the scope come with a collimating eyepiece?

Does the scope come with a collimating eyepiece?
Asked by: Janet
The Sky-Watcher Flextube 300P 12" Collapsible Dobsonian Telescope Kit does not come with a collimation eyepiece.
Answered by: Simcha B
Date published: 2026-05-04
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