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- 80 mm apochromatic 3-element refractor
 - 400 mm (f/5)
 - Fully multi-coated
 - Thread-on field flattener included
 - 2.7″ focuser w/micro focus
 - 2″ Diagonal with dielectric coatings
 - 8×50 RA erect-image finderscope
 - Canon camera adapter included
 - Tube rings with CG5 (Vixen) style dovetail bar
 - Aluminum foam lined case
 - 33mm image circle
 - OTA Weight: 8.8lbs.
 - OTA Length: 17.375″ (fixed dew shield)
 - Back focus: 75mm
 
Features
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, Vixen-style dovetail and padded case. Everything you need to get out under the stars.
Specifications
| Optical Info | |
|---|---|
| Optical Design | ED Triplet Refractor | 
| Lens Coatings | Fully Multi-Coated | 
| Glass Type | BK7 (2)/FPL-53(ED) | 
| Primary Aperture (mm) | 80 | 
| F/Ratio | 5 | 
| Focal Length (mm) | 400 | 
| Observational Info | |
| Dawes Limit | 1.45 | 
| Rayleigh Limit | 1.75 | 
| Limiting Mag. | 12 | 
| Minimum Magnification | 11 | 
| Maximum Magnification | 157 | 
| General Info | |
| Focuser | 2.7" Dual Speed R&P | 
| OTA Length (Retract/Ext.) | 17.4" | 
| OTA Outer Diameter | 4.875" | 
| OTA Weight (with accessories) | 8.8 | 
| Accessories | |
| Included Finder | 8x50 RACI | 
| Included Diagonal | 2" Dielectric | 
| Mounting Accessories | V-Rail Foot | 
| Included Eyepieces | None | 
| Included Case | Yes | 
| Corrector | Yes | 
            







