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Sky-Watcher USA - Esprit 120mm ED Triplet APO Refractor


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Manufactured by: Sky-Watcher USA


Sky-Watcher USA Esprit 120mm ED Triplet APO Refractor




Designed wtih the discerning astrophotographer in mind, Sky-Watcher USA’s top-of-the-line Esprit refractors deliver the kind of imaging performance one would expect from telescopes costing thousands of dollars more.

With their three-element air spaced objective lens design, false color is completely eliminated, yielding exceptional contrast and sharpness. The included 2-element field corrector guarantees a flat field across the entire imaging plane. The Sky-Watcher exclusive Helinear Track focusing system provides a smooth, rock-solid focuser with zero image shift.

All Sky-Watcher USA Esprit refractors come with a 9 x 50 right angle finderscope, 2-inch Star diagonal, 2-element field flattener*, camera adapter, D-style dovetail and padded case. Everything you need to get out under the stars.



Quick Overview:

  • 120 mm apochromatic 3-element refractor
  • 840 mm (f/7)
  • Fully multi-coated
  • Thread-on field flattener
  • 3.0" focuser w/micro focus
  • 2" Diagonal with dielectric coatings
  • 9x50 RA erect-image finderscope
  • Canon camera adapter
  • Tube rings with CGE style dovetail bar
  • Aluminum foam lined case
  • 43mm image circle
  • OTA Weight: 22lbs.
  • OTA Length: 31.5" Extended and 27.375" Retracted
    Back focus: 75mm









Additional Information

Name Sky-Watcher USA - Esprit 120mm ED Triplet APO Refractor
Manufacturer Sky-Watcher USA
Model S11420
Manufacturer Part No S11420
Telescope Aperture 4.1" - 5"
Aperture 120 mm (4.72 in)
Field Flattener Included, thread-on
Finderscope 9x50, erect-image, right-angle
Focal Length 840 mm (33 in)
Focal Ratio 7
Highest Useful Magnification 283 x
Light Gathering Power 294 x
Limiting Stellar Magnitude 12.9
Lowest Useful Magnification 17 x
Optical Coatings Fully multi-coated
Optical Design Refractor
Optical Tube Length 30 in (762 mm)
Optical Tube Weight 23 lbs (10 kg)
Resolution (Dawes) 0.97 arc seconds
Resolution (Rayleigh) 1.16 arc seconds
Star Diagonal 2", dielectric coatings