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