Sky-Watcher
Esprit 80mm ED APO Triplet Refractor
SKU: S11400
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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
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.
| 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 |