Sky-Watcher Flextube 400P SynScan GoTo Collapsible Dobsonian (16″ mirror)


  • Large 406mm aperture delivers dazzling views, 1800mm focal length, f/4.4 focal ratio
  • Built in Wi-Fi telescope control
  • Innovative collapsible design for portability, storage, and back focus for astrophotography all while retaining collimation
  • 3257x more light-gathering power than the human eye
  • Patented Freedom Find™ technology uses dual encoders to allow manual control while retaining alignment
  • Patented tension control handle allows for precise slewing and maximum stability
  • Parabolic primary mirror with Radiant™ Aluminum Quartz (RAQ™) coating for 94% light reflectivity
  • Heavy-duty rocker box with Teflon™ bearings provide a stable base with smooth motion
  • 2-inch single-speed Crayford-style focuser with 1.25-inch adapter allows for use of nearly any eyepiece
  • 9×50 straight-through finderscope, 10 and 25mm 4-element 1.25-inch Plössl eyepieces, and SynScan hand controller with 42,000+ object database included

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SKU: S11840 Categories: , , ,


Sky-Watcher’s Flextube SynScan GoTo Collapsible Dobsonian series are the telescopes your mother warned you about. Big aperture, bigger attitude, with all the innovations that make Sky-Watcher the obvious choice when hunting for that Goldilocks zone where value meets desire. Ranging from the standard 8 to a whopping 16 inches in diameter, Flextube SynScan Dobsonians are precision engineered instruments that will allow you to easily find and enjoy viewing night sky treasures such as planets and the Moon, nebulae, star clusters, galaxies and much more. With its patented collapsible tube design, these Dobsonians are truly the ultimate in portability and performance which is crucial when travelling to dark skies to make the most of these impressively large telescopes.

The elegant truss tube design was carefully engineered to combine ease of use, extreme portability, and consistent performance in an affordable package. Unlike other truss tube designs, the Flextube Dobsonian does not need to be disassembled between uses. It transports as two compact pieces (optical tube and rocker box) that can be assembled and ready to use in just seconds! It is easy to collimate once set up, and it holds its collimation throughout the evening and even after being collapsed! The patented Tension Control Handle allows users to add or reduce tension, thereby increasing or decreasing the friction between the optical tube and the sideboards. The patented Freedom Find dual encoder design allows the telescope to be moved manually whenever the user wishes – but with no need for re-alignment!

The SynScan hand controller allows you to point your telescope to a specific object, or even tour the best objects in the night sky at the touch of a button!! The user-friendly menu system allows automatic slewing to over 42,900 objects. Even an inexperienced astronomer can master its variety of features in a few observing sessions.

The Flextube SynScan series seamlessly combines the convenience and affordability of the traditional Dobsonian with the performance and precision of a computerized GoTo telescope all to help you in your quest for big aperture views.

SynScan hand control SPECIFICATIONS:

  • Built-in Wi-Fi control
  • Power supply: 10 to 15 V DC 1Amp, 2.1mm plug (center positive)
  • 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, and Solar
  • Tracking mode: Dual Axis Tracking
  • Alignment method: Brightest-Star Alignment, Two-Star Alignment
  • Database: 25 user defined objects. Complete Messier, NGC and IC catalog, partial SAO catalogues, with a total 42,900 objects
  • GoTo pointing accuracy: Up to 5 arc min
SKU S11840
UPC 050234118408
Optical Info
Optical Design Newtonian
Mirror Coatings Radiant Aluminum Quartz (RAQ)™ coatings with 94% reflectivity
Glass Type Borosilicate
Primary Aperture (mm) 406
F/Ratio 4.4
Focal Length (mm) 1800
Secondary Diameter 102mm
Secondary Obstruction (by diameter) 25%
Secondary Obstruction by Area 6%
Observational Info
Dawes Limit 0.29
Rayleigh Limit 0.34
Limiting Mag. 15.5
Minimum Magnification 58
Maximum Magnification 799
Light Gathering (compared to next size down) 30%
General Info
Focuser 2″ Dual Speed Crayford
OTA Length (Retract/Ext.) 42.5″/66.5″
OTA Outer Diameter 17.875″
OTA Weight (with accessories) 72
Dob Base Weight 105
Dob Base Measurements 36″x34″
Zenith Eyepiece Height 74″
Included Finder 9×50 Finder
Included Diagonal No
Included Eyepieces 25/10 Plossl
Magnification w/ Included Eyepieces 72x/180x