- 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
- 40mm image circle
- OTA Weight: 16.3lbs.
- OTA Length: 24.5" Extended and 17.3125" Retracted
- Back focus: 68.819mm
Designed wtih 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 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.
|Field Flattener||Included, thread-on|
|Aperture (mm)||100 mm (3.94 in)|
|Focal Length||500 mm (20 in)|
|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)|