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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 |