Esprit 100mm ED APO Triplet Refractor

SKU: S11410

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  • $2,650.00
  • Regular price $3,210.00

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  • 100 mm apochromatic 3-element refractor
  • 550 mm (f/5.5)
  • Fully multi-coated
  • Thread-on field flattener
  • 3.4″ focuser w/micro focus
  • 2″ Diagonal with dielectric coatings
  • 8×50 RA erect-image finderscope
  • Canon camera adapter
  • Tube rings with CGE style dovetail bar
  • Aluminum foam lined case
  • 40mm image circle
  • OTA Weight: 16.3lbs.
  • OTA Length: 24.5″ Extended and 17.3125″ Retracted
  • Back focus: 68.819mm

Designed with 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 8 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

ED Triplet

Primary Aperture (mm)

100mm (4″)

Focal Ratio


Focal Length (mm)


Glass Type

Schott/Ohara ED

Lens Coatings

Fully Multi-Coated

OTA Length

Dew Shield Retracted: 18.3″ Dew Shield Extended: 24.5″

OTA Outer Diameter


OTA Weight (with accessories)

16 lbs.


3.4″ Dual Speed R&P

Included Eyepieces


Included Diagonal

2″ Dielectric

Included Finder

8×50 Right Angle Correct Image

Includes Case


Mounting Accessories



Yes, included field flattener.

Image Circle (w/ Flattener)


Other Included Items

Canon 48mm camera adapter with spacers

Dawes Limit


Rayleigh Limit


Limiting Magnitude


    Barcode: 050234114103