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White 8-inch Newtonian reflector on a wooden Dobsonian base

Sky-Watcher

Sky-Watcher 8" f/5.9 Traditional Dobsonian S11610

SKU CH-FX1M-JXR52

An 8" Newtonian reflector with 203mm aperture, 1200mm f/5.9 focal length and 406x magnification on a Dobsonian mount with tension control

  • PartS11610
  • TypeTelescopes
  • SpecificationsOptical Design - Newtonian Reflector
  • ColorWhite
  • Objective Lens203mm
  • Total Magnification406x
  • Large 203 mm aperture gathers more light for faint objects
  • f/5.9 focal ratio provides wide-field views at 1200 mm focal length
  • Paraboloidal primary mirror eliminates spherical aberration for sharp images
  • Ultra-thin .5 mm secondary supports reduce diffraction spikes and light loss
  • 2 inch focuser with 1.25 inch adapter accepts both eyepiece sizes

8-inch Dobsonian reflector

The Sky-Watcher 8-inch f/5.9 Traditional Dobsonian is a Newtonian reflector telescope built for visual astronomy. Its 203 mm parabolic primary mirror gathers ample light for deep-sky observation. A four-arm secondary holder with 0.5 mm supports reduces diffraction spikes. The 1200 mm focal length yields a fast f/5.9 ratio for bright images.

Suited for visual deep-sky observers

This telescope serves backyard astronomers who want large aperture on a simple altitude-azimuth base. The 2-inch focuser with 1.25-inch adapter accepts common eyepieces. Buyers needing motorised tracking for long-exposure imaging should consider a different mounting style. The tension control handle aids manual pointing but does not automate it.

203 mm aperture defines capability

The 203 mm objective sets the practical magnification ceiling at 406x and determines light grasp for faint galaxies and nebulae. All other specifications derive from this aperture and the 1200 mm focal length. Match eyepiece choice to the f/5.9 focal ratio for optimal exit pupils.

Highlights

  • Large 203 mm aperture gathers more light for faint objects
  • f/5.9 focal ratio provides wide-field views at 1200 mm focal length
  • Paraboloidal primary mirror eliminates spherical aberration for sharp images
  • Ultra-thin .5 mm secondary supports reduce diffraction spikes and light loss
  • 2 inch focuser with 1.25 inch adapter accepts both eyepiece sizes

Specifications

BrandSky-Watcher
Model8" f/5.9 Traditional Dobsonian
PartS11610
TypeTelescopes
SpecificationsOptical Design - Newtonian Reflector
ColorWhite
Objective Lens203mm
Total Magnification406x
Features1200 mm focal length (f/5.9)

Questions about this item

How do I set up the 203 mm Newtonian reflector on the Dobsonian base and what step is often missed?

Place the optical tube onto the altitude bearings, secure the tension control handle, then insert the 1.25" adapter into the 2" focuser before attaching an eyepiece — many forget the adapter.

Which parts of the 8" f/5.9 Dobsonian will need maintenance or replacement over time?

The paraboloidal primary mirror may require occasional re-collimation; the 0.5 mm secondary-mirror supports and the tension control handle can wear and need replacement after heavy use.

What limit appears first during a long observing session with the 1200 mm focal-length telescope?

The altitude tension handled by the control handle can loosen, causing the tube to drift before mirror cooling or eyepiece fogging become issues.

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