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Sky Watcher Esprit 120mm ED Triplet Apo Refractor OTA # S11420

5.0 (1 Reviews) Read Reviews Write Review
Brand Sky Watcher
Part Number S11420

Product Info

Manufacturer Description

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.


  • Optical Design: Refractor
  • Field Flattener: Included, thread-on
  • Aperture (mm): 120 mm (4.72 in)
  • Focal Length: 840 mm
  • Focal Ratio: 7
  • Finder Scope: 9x50, erect-image, right-angle
  • Diagonal: 2", dielectric coatings
  • Tube Rings: With 3" (CGE Style) dovetail plate
  • Highest Useful Magnification: 283 x
  • Lowest Useful Magnification: 17 x
  • Resolution (Rayleigh): 1.16 arc seconds
  • Resolution (Dawes): .97 arc seconds
  • Light Gathering Power (Compared to human eye): 294 x
  • Optical Coatings: Fully multi-coated
  • Fully Illuminated Field: 43 mm (1.69 in)
  • Optical Tube Length: 30 in (762 mm)
  • Optical Tube Weight: 23 lbs (10 kg)


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

Manufacturer part number: S11420


5.0 (Based on 1 Reviews) 100% of reviewers recommended this product.
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    1. orion58

      orion58 Member

      Skill Level
      Time with Product
      User Notes:
      Review by Bruce of Southern Wisconsin.
      Jan 25, 2016

      5.0 Solid Performer


      Quality Lenses,Easy to Use,Strong Construction



      As an astrophotographer I was looking for an OTA that I could use for both nebula and galaxies. The Esprit 120 with a focal length of 840mm (f/7) fit my requirements.

      I have had this telescope for about 2 months and could not be more satisfied. The dedicated flattener (supplied) provides pinpoint stars across the field and into the corners of my images. In addition this OTA pulls out detail and provides contrast that is above what I had even hoped for. It is simply a pleasure to image with the Esprit.

      Although I seldom do any observing I recently decided to give it a try. My first target was the double cluster in Perseus - the stars were pinpoints of light and the view was 3 dimensional. I found myself just staring into the eyepiece soaking it all in. I continued for the next couple hours viewing globular clusters, planetary nebula, open clusters and assorted DSOs - all with the same result. For the finale I swung over the waning crescent moon using an 8.8mm eyepiece (95x). The lunar mountains and craters seemed to jump out at me. To push a little further I put in a 2X barlow (now at 190x). The views did not suffer - crystal clear.

      I did my research before ordering the Esprit 120. I bought it because of 1) the solid reviews and 2) the value this package provides. Included were a 2 inch diagonal, finder scope, dedicated flattener and adapters for a DSLR camera connection. The aluminum case the scope arrived in (inside a box of course) was impressive in its own right. Well-padded and built like a tank it provides complete protection for this scope in the event you want to travel with it.

      Sky-Watcher has done a fantastic job with the Esprit line and Agena Astro, as always, has provided great customer service. I look forward to many years of imaging and observing with the Esprit 120.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

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      Telescope Aperture 4.72" (120mm)
      Manufacturer Sky Watcher
      Telescope Aperture 81mm - 125mm
      Telescope Series Sky Watcher Esprit APO