Sky-Watcher Flextube 400P 406mm (16") Synscan Computerized Goto Collapsible Dobsonian Telescope

Sky-Watcher Flextube 400P 406mm (16") Synscan Computerized Goto Collapsible Dobsonian Telescope

Due to high demand and global product shortages due to the pandemic, please call for availability.

Introducing the Sky-Watcher 16" Computerized Dobsonian telescope. This marvel combines big aperture with a collapsible design that fits into mini-vans, SUV's and trucks, or a car trailer. The largest aperture scope in the Sky-Watcher fleet has been coupled with the Synscan computer drive system, making this scope an outstanding value for the level of light gathering and functionality that it provides. Deep space views are simply stunning.

The computer drive system is rather clever. If you nudge a traditional computerized telescope, the computer has no clue that you moved it, and how far. Not so with this Dob.

The closed-loop system incorporates motor drives and high resolution gear-driven optical encoders coupled to each axis providing accurate slews, while registering all movement - even if you push the telescope out of position.

This Dobsonian collapses by running up and down on three vertical bars fixed to the top section, reducing the need for collimation upon setup, which can be an issue for truss-tube Dobsonians. The base collapses into 6 wooden pieces simply by unscrewing the thumbscrews; no tools required.

As an added bonus, if the instrument is collapsed slightly, binocular viewers will come to focus and can be used without the need for a Barlow or image amplifier - a big plus for deep space binocular viewing.

The parabolic primary mirror brings the rays of light to a common focal point, there-by correcting for spherical abberation. The tapered mirror design with additional glass support ridges means the mirror is full-thickness where it counts right in the middle, and tapers off towards the edge. This design reduces the thermal mass of the mirror, and improves acclimatization time. The mirror is supported at the thickest point in the middle, and no diffraction-inducing mirror clips are required.

Sky-Watcher computerized Dobsonians support a GPS receiver (sold separately). This plug-in module will set your time, date, longitude and latitude automatically based on the Global Positioning Satellites orbiting the Earth. You can also plug this GPS receiver into your PC's USB port to add geo location capabilities. One possible use is contributing to the Open Street Mapping project.


  • Parabolic primary mirror to focus all light rays to a common focal point
  • Clip-less tapered mirror design offers excellent stability and acclimatization
  • Sturdy collapsible Newtonian Reflector Optical Tube Assembly
  • Closed-loop drive system provides accurate automatic positioning, even when manually nudged
  • Includes "The Beginners Guide to Using Telescopes" written by our knowledgeable staff.


  • Aperture: 406mm (16")
  • Focal Length: 1800mm
  • Focal Ratio: f/4.4
  • Mirror Type: Parabolic, Tapered Pyrex
  • Focuser: 2" cast aluminum, dual speed crayford, with lock screw
  • Eyepieces: 25mm (72x) and 10mm (180x) Plossls
  • Barlow lens: Available (sold separately)
  • Finderscope: 8x50 straight
  • Mount Type: Dobsonian Altazimuth
  • Tracking Motor: Built-in
  • Polar Finder: Not Available
  • Camera Capable:
    • USB imagers
    • All-in-one cameras via universal digital camera adapter
    • DSLR/SLR (requires T2 ring)
    • Above cameras and adapters sold separately
  • Height of eyepiece (pointed to Zenith): 180cm (71")
  • Height of optical tube and assembled base: 135cm-195cm (53"-77")
  • Optical tube length: 109cm-170cm (43"-67")
  • Optical tube weight: 30.5kg (67lbs)
  • Ground board diameter: 84cm (33")
  • Base weight: 40.5kg (89lbs)
  • Total Weight: 71kg (156lbs)
  • Two year limited warranty

Computer Drive Specifications

  • SynScan computerized go-to system
  • Over 42,000 objects in the database including complete Messier, NGC, and IC catalogues
  • RS-232 port
  • USB port
  • Flash-upgradeable firmware
  • Accuracy enhanced by software collimation error (mount mechanical error) compensation
  • Optically encoded closed-loop drive system
  • Servo motor drives
  • 9 slewing speeds:
    • 1x (0.25arc-min/sec), 2x (0.5 arc-min/sec), 8x(2 arc-min/sec)
    • 16x(4 arc-min/sec), 32x (8 arc-min/sec), 200x (50 arc-min/sec)
    • 400x (1.6°/sec), 600x (2.5°/sec), 800x (3.3°/sec), 1000x (4.2°/sec)
  • Includes 12v car plug-in adapter
  • Requires 12v DC 2A (Tip positive)

Shipping Information

This shipment contains one or more large and/or heavy boxes, and may require two to four people to safely take off the delivery truck.

There is an additional charge for powered tailgate lift service if you require it, starting from $150.00 CAD.

Due to liability concerns, the truck driver will not bring the boxes into your home.

  • Box 1: Optical Tube Assembly, 120 x 66 x 64 cm, 33 kg
  • Box 2: Base, 103 x 96 x 35 cm, 67 kg **Very large and heavy**
  • Box 3: Primary mirror, 54 x 54 x 28 cm, 15 kg