Sky-Watcher 120mm Esprit ED Triplet APO Refractor

Sky-Watcher 120mm Esprit ED Triplet APO Refractor
Item # SW-S11420
2 Questions(s)

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  • This 4.7" ED Triplet APO Refractor was designed by Sky-Watcher with astro-imagers in mind! The included two element corrector produces a flat field across the entire imaging plane, and the 120mm f/7 air-spaced objective lens with FMC yields a sharp, contrasty image with no false color.
  • The 3.4" rack & pinion focuser on this quality Esprit telescope is as solid as they come, and sports micro focusing abilities. This focuser can handle a multi-part imaging system just fine, with no image shift!
  • Accessories for the Sky-Watcher 120mm ED Triplet APO Refractor include a 2" dielectric diagonal, a 9X50 erect-image finder, tube rings with a D style dovetail, and even an aluminum case with interior foam lining.


Sky-Watcher Esprit ED APO Triplet Refractors...

The Sky-Watcher Esprit line of high-quality ED Triplet APO refractors will perform flawlessly whether you enjoy it as a visual instrument or use it as a giant lens to image the Universe with one of today's amazing CCD cameras. The designers of this telescope line concentrated on the desires and requirements of the avid astro-imager, from a three-element apochromatic objective with included thread-on field flattener to the beefy oversized micro-focuser.

The air-spaced ED APO optics are fully multi-coated for extra clarity, contrast, and protection, and the two-element corrector, which comes standard with the Sky-Watcher Esprit, will ensure a flat field across the entire focal plane. This system produces a 43mm image circle, and you have about 75mm of back focus for plenty of imaging accessories. The dew shield, when extended, will protect the optics from dew and help increase contrast by blocking stray light that might otherwise strike the glass. However, the shield is fully retractable when necessary in order to shorten your OTA for storage and travel

The Helinear Track Focusing System, a Sky-Watcher exclusive, is a rock-solid 3.4" rack & pinion focuser that will perform smoothly, without image shift, due to the extra support rail on the top of the drawtube. The micro focuser allows you to make course and fine adjustments to focus, and the knobs are easy to turn, even with cold hands or with gloves on. A thread-on step down ring takes the opening down for 2" accessories, and a 2" to 1.25" adapter is included in the package.

Accessories are a big part of any telescope system, and Sky-Watcher wants to make sure that you start out right. Included with every Esprit refractor is a 2" dielectric diagonal, a 9 x 50 RA erect-image finderscope and bracket, a Canon camera adapter, tube rings with a CGE ("D" style) dovetail bar, and an aluminum foam-lined case.

Additional Information

Additional Information

SKU SW-S11420
UPC Code 50234114202
Manufacturer Sky-Watcher
Telescope Series Sky-Watcher Esprit
Optical Design Refractor - Apochromatic
Mount Type None - Optical Tube Only
Telescope Aperture 4.7"
Telescope Focal Length 840mm
Telescope Focal Ratio f/7
Highest Useful Magnification 283x
Limiting Stellar Magnitude 12.9
Optical Coatings Fully Multi-Coated
Dew Shield Included? Yes
Length of Optical Tube 31.5" Extended, 27.4" Retracted
Optical Tube Weight 22 lb.
Tube Color or Finish Gloss White
Finder Included 9 x 50 Optical Finder
Alignment Procedure N/A
Included Items

Included Items

  • Sky-Watcher 4.7" f/7 ED Triplet APO Refractor
  • Thread-on Field Flattener
  • 3.4" Rack & Pinion Microfocuser
  • 3.4" to 2" Thread on Adapter
  • 2" to 1.25" Adapter
  • 2" Diagonal
  • Canon Camera Adapter
  • Tube Rings with "D" Series Dovetail Bar
  • Aluminum Case
Questions & Answers

Product Questions

What adapters are required to use a Starlight Xpress SXVR-M25c camera (back focus 17.5mm) with this field flattener?

Are these adapters available from OPT?
Can you recommend a good focal reducer to get to maybe f/5.5? I use a TMB LOMO 80 natively at F/6 with a TV 0.8 flattened reducer. Might that work well covering a qsi583?

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