Sky-Watcher 12" f/4.9 Collapsible GoTo Dobsonian Telescope

Sky-Watcher 12" f/4.9 Collapsible GoTo Dobsonian Telescope

Sky-Watcher 12" f/4.9 Collapsible GoTo Dobsonian Telescope

B&H # SK12GTCD MFR # S11820
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Value: $35.00

Product Highlights

  • Patented Collapsible OTA Design
  • 12" / 305mm Aperture
  • 1500mm Focal Length, f/4.9 Focal Ratio
  • 8x50 Straight-View Finderscope
  • 2" Single-Speed Crayford-Style
  • 25mm and 10mm Plossl Eyepieces
  • 8x50 Right-Angle Erector Finderscope
  • SynScan Computer Hand Controller
  • 42,000+ Object Database
  • DC Servo Motors with Dual Encoders
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Aperture: 12"


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Sky-Watcher S11820 overview

  • 1Description

Sky-Watcher improves on the often unwieldy standard design of Dobsonians with their 12" f/4.9 Collapsible GoTo Dobsonian Telescope. It features a patented truss tube system that enables the front corrector plate/eyepiece assembly to be moved back and locked against the main rear tube to greatly reduce the size of the OTA for storage and transportation. This open OTA also has the benefit of reducing overall weight versus standard Dobs. To add another level of usability to the scope is a motorized ground-based rocker alt-az mount. Equipped with dual servo motors, they are controlled using the SynScan computer hand controller. This self-contained system features over 42,000 celestial objects with alignment assistance, guided tours and full go-to capabilities. Its dual encoders, coupled with the patented Tension Control Handle, enable users to manually move the scope without having to realign it.

It features a large 12" aperture parabolic mirror that captures enough light to make detailed observations of the Moon and planets, and still reach out past our solar system to discover deep-sky subjects such as nebulae, globular clusters, and galaxies. Its f/4.9 focal ratio and Crayford focuser makes this an ideal choice for imaging. Its relatively fast focal ratio enables devices to capture images in less time than slower scopes, while the unique focusing mechanism employed in the Crayford-style gives it the ability to achieve tack-sharp focusing with zero back-lash that rack-and-pinion focusers generally are unable to achieve.

Optical Performance
  • 12" aperture
  • f/4.9 focal ratio
  • 1500mm focal length
  • Efficient, highly reflective mirrors increase image brightness
SynScan System
  • Motor type: DC Servo Motors
  • Resolution:
    • Motor encoder: 1,620,000 counts per revolution
    • Main axis encoder: 11,748 counts per revolution
  • Slew speeds: 1.0X, 2.0X, 8X, 16X, 32X, 200X, 400X, 600X, 800X, 1000X
  • Tracking Rates: Sidereal, Lunar, Solar
  • Tracking Mode: Dual Axes Tracking
  • Alignment Method: Brightest-Star Alignment, Two-Star Alignment
  • Database: 25 user defined objects. Complete M, NGC and IC catalog, partial SAO catalogues, total 42,900 objects
  • Go-To Pointing Accuracy: Up to 5 arc min
  • Crayford-style, single-speed
  • Accepts 2" eyepieces and accessories
  • Crayford focusers use a toothless friction system that allows for super-fine precision focusing without backlash
  • Includes 2-to-1.25" adapter
  • Alt-az rocker design
  • Teflon azimuth bearings
  • Teflon bearings and tension clutch on altitude axis
  • Tension control handle allows for smoother rotation to reduce vibrations and limit over-compensation
Eyepiece & Accessories
  • Eyepieces:
    • 4-element Plossl
    • 1.25" diameter barrel
    • 25mm yields 60x power
    • 10mm yields 150x power
  • Finderscope:
    • 8x50 erect-image
    • Right-angle viewing
UPC: 050234118200
In the Box
Sky-Watcher 12" f/4.9 Collapsible GoTo Dobsonian Telescope
  • 8x50 Finderscope
  • 10mm Plossl Eyepiece
  • 25mm Plossl Eyepiece
  • 2"-to-1.25" Adapter
  • Limited Two-Year Warranty
  • Table of Contents
    • 1Description

    Sky-Watcher S11820 specs

    Optical Design Reflector
    Aperture 12" / 305 mm
    Focal Length 1500 mm
    Focal Ratio f/4.9
    Eyepiece Barrel Diameter 2" directly to focuser
    1.25" with included adapter
    Diagonal N/A
    Finderscope 8x50 right angle erect-image
    Tripod None
    Mount Type Motorized alt-az
    Power Source 10 - 15 VDC 1 A
    2.1 mm plug
    Optical Tube Dimensions Not specified by manufacturer
    Weight Tube: 46.2 lb / 21.0 kg
    Base: 53.0 lb / 24.0 kg
    Assembled: 99.2 lb / 45..0 kg
    Packaging Info
    Package Weight 138.8 lb
    Box Dimensions (LxWxH) 41.0 x 35.0 x 29.0"

    Sky-Watcher S11820 reviews

    12" f/4.9 Collapsible GoTo Dobsonian Telescope is rated 4.0 out of 5 by 1.
    Rated 4 out of 5 by from Believe I made the right purchase but... I know I'm going to love this telescope. But it will take some getting used to a Dobsonian. I have had it out only two times, so this is an initial reaction. The alignment of stars in the finderscope is difficult. For the money spent, the finderscope should come equipped with a diagonal. It's almost impossible to line up on a star for anyone older than 30. I have already purchased an Orion 9x50 diagonal finderscope for $87 and I'm hopeful this will help. I have also taped a laser to the scope to help me move the scope close to the target, or else I would be needing physical therapy. Also purchased the shroud to cover the struts to protect the mirrors from dust and light. Weight is manageable once it is split into two parts for moving.
    Date published: 2017-10-29
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