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Sky-Watcher Esprit 100mm ED Triplet APO Refractor

SKU : SW-S11410

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  • 100mm (3.94-inch) aperture.
  • f/5.5 focal ratio.
  • 550mm Focal Length
  • Up to 236x magnification.
  • 9x50 optical finder included.
  • Spectacular imaging performance.


Product Details

  • The Sky-Watcher 100mm Esprit ED Triplet APO Refractorwas designed with astro-imagers in mind that are eager to develop their astrophotography skills. Its three-element air spaced objective lens design, fully removes false color giving you prime contrast and sharpness. The included two-element field corrector guarantees a flat field across the entire imaging plane giving you brighter images. 

    The air-spaced ED APO Opticsare fully multi-coated for extra clarity, contrast, and protection. Three-element apochromatic objective with an included thread-on field flattener to the oversized micro-focuser. This system produces a 40 mm image circle, and you have about 69 mm of back focus for plenty of imaging accessories. Use it as a giant lens to capture the Universe with one of today’s amazing CCD cameras.

    TheDew Shield, when extended, will protect the optics from dew and help increase contrast by blocking stray light that might otherwise strike the glass. 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 2.7-inch rack and 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 strong 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-inch accessories.


  • specifications

    Aperture100 mm (4")
    Dew Shield IncludedYes
    Exterior ColorGloss White
    Focal Length550 mm
    Focal Ratiof/5.5
    Free ShippingYes
    Highest Useful Magnification236x
    Limiting Stellar Magnitude12.5
    Optical DesignTriplet Refractor
    OTA Length24.5" Extended & 17.3" Retracted
    OTA Weight16.3 lb.
  • included items

    • Sky-Watcher 4-inch f/5.5 ED Triplet APO Refractor.
    • 9 x 50 RA Erect-image Finderscope and Bracket.
    • Thread-on Field Flattener.
    • 2.7-inch Rack and Pinion Microfocuser.
    • 2.7-inch to 2-inch Thread on Adapter.
    • 2-inch to 1.25-inch Adapter.
    • 2-inch Diagonal.
    • Canon Camera Adapter.
    • Tube Rings with D-Series Dovetail Bar.
    • Aluminum Case.

Product Reviews

Customer Reviews
5.0 Based on 4 Reviews
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  • imaging sessions
  • transport
  • payload
  • protection
  • guiding
  • Sky Watcher
  • thumbscrew
  • camera sensor
  • right
  • corners
United States United States

Nice Optical Quality

Received this scope a few weeks ago and have done 3 imaging sessions which worked out well. A great FOV which appears flat right to the corners. Optics were well collimated and threaded connections generated a perfect planarity with my camera sensor. Especially liked that Sky Watcher provides the proper field flattener with the scope without requiring a separate purchase. Great value for the money for a 100 mm aperture telescope. Carry case is super sturdy and should provide protection during transport for a lifetime. Finder scope base is a bit lower in quality with a single thumbscrew for the finder bracket. The Losmandy dovetail provided is sturdy but is a bit short for imagers who want more leeway to balance the payload for proper guiding. Overall the optical quality outweighs the minor drawbacks. ++

Joseph D.
United States United States


So far this scope has been perfect! I have not used for visual at all. Upon receiving I installed ASI294MC Pro, ZWO filter drawer, EAF focuser and ASIAIR Pro. I used the included 9x50 finder scope as a guide scope by unscrewing the diagonal and 3D printing an adapter for an ASI290MM. This all rides easily on a Skywatcher EQ6R-Pro. I absolutely love the scope and setup. I can precisely polar align in about 3 mins, select a target, and go to bed. Tracking is super accurate and the meridian flip happens automatically. Next morning I'm blessed with a USB drive filled with tack sharp images. I've used the scope now for hundreds of exposures over dozens of targets and every time it seems to just work and produces great images right to the edge of the field. I was very impressed with OPT telescope also, the scope came in just a couple of days from when I placed the order.

United States United States

SkyWatcher 100 Esprit ED

Excellent refractor. Would be better if a filter holder was included for the price.

Michael E.
United States United States

Esprit 100ed

Definitely the best scope I have used in its class. I love using it, it’s clear, matches with my camera well, AND I can use visually if I wanted to. I think smaller is better for beginners, but I would still recommend this as a good starter scope. It comes with everything you need MINUS the mount of course