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Stargazing Aug 31st ✦ 7pm-10pm
Stargazing Aug 31st ✦ 7pm-10pm

Esprit 100mm ED Triplet APO Refractor

Original price $3,210.00
Current price $2,650.00
SKU S11410

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  • 100 mm apochromatic 3-element refractor
  • 550 mm (f/5.5)
  • 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: 16.3lbs.
  • OTA Length: OTA Length: 24.5" Extended and 17.3125" Retracted
  • Back focus: 68.819mm

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: 100 mm (3.94 in)
  • Focal Length: 550 mm
  • Focal Ratio: f/5.5
  • Finderscope: 9x50, erect-image, right-angle
  • Diagonal: 2", dielectric coatings
  • Tube Rings: With 3" (CGE Style) dovetail plate
  • Highest Useful Magnification: 236 x
  • Lowest Useful Magnification: 14 x
  • Limiting Stellar Magnitude: 12.5
  • Resolution (Rayleigh): 1.39 arc seconds
  • Resolution (Dawes): 1.16 arc seconds
  • Light Gathering Power (Compared to human eye): 204 x
  • Optical Coatings: Fully multi-coated
  • Fully Illuminated Field: 43 mm (1.69 in)
  • Optical Tube Length: 17 in (432 mm)
  • Optical Tube Weight: 18 lbs (8.16 kg)