A Guide to Choosing Astronomy Eyepieces for Binoviewers

Sky Watcher 10” Quattro Imaging Newtonian Telescope # S11220

Our Price: $815.00
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In Stock (1 Available)
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Our Product ID: T-SW-S11220
Manufacturer SKU: S11220
Item Can Ship: To US Only
Sky Watcher 10” Quattro Imaging Newtonian Telescope # S11220

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  • Sky Watcher 10” Quattro Imaging Newtonian Telescope # S11220

Quick Overview

  • 254 mm Newtonian reflector
  • 1000 mm (f/4)
  • Fully multi-coated borosilicate mirrors
  • 2” dual-speed 10:1 linear power focuser
  • 8x50 finderscope
  • Tube rings with D-style dovetail bar

Product Details

The new Sky-Watcher Quattro Imaging Newtonian with dual-speed focuser incorporates a superb mirror-set with two significant advantages over competing products. A 2" dual-speed 10:1 ratio focuser is included for excellent focusing precision. Additionally, the tube length has been slightly shortened to optimize performance for prime-focus photography. Even better performance for astro-photography, and visual use, can be achieved when used in combination with the Sky-Watcher Quattro coma corrector.


  • Optical Design:Newtonian Reflector
  • Aperture (mm): 254 mm (10 in)
  • Focal Length: 1000 mm
  • Focal Ratio: f/4
  • Finderscope: 8x50 Viewfinder
  • Tube Rings: Tube rings with D-style dovetail bar
  • Optical Coatings: Fully multi-coated

Additional Information:

  • OTA length: 36.5"
  • OTA width: 11.375"
  • OTA weight (with accessories): 36.5 lbs

Product carries full 2 year manufacturer factory limited warranty (within US only).

Manufacturer part number: S11220

Manufacturer Sky Watcher
General Specs
Focuser 2" Dual Speed Crayford
OTA Length 36.5"
OTA Outer Diameter 11.375"
OTA Weight (with accessories) 36.5
Optical Specs
Mirror Coatings 94% Aluminum
Lens Coatings N/A
Glass Type Borosilicate
True Aperture (mm) 257
Primary Aperture (mm) 254
Primary Edge Thickness N/A
F/Ratio 4
Focal Length (mm) 1000
Secondary Obstruction (by diameter) 35%
Secondary Obstruction by Area 12%
Included Accessories
Included Finder 9x50 Finder
Included Diagonal No
Mounting Accessories Rings/V-Rail
Included Eyepieces None
Magnification w/ Included Eyepieces N/A
Included Case No
Corrector No (Optional)
Observational Specs.
Dawes Limit 0.46
Rayleigh Limit 0.55
Limiting Mag. 14.5
Minimum Magnification 36
Maximum Magnification 500
Light Gathering (compared to next size down) 57%