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- 120 mm apochromatic 3-element refractor
- 840 mm (f/7)
- Fully multi-coated
- Thread-on field flattener
- 3.0″ focuser w/micro focus
- 2″ Diagonal with dielectric coatings
- 9×50 RA erect-image finder scope
- Canon camera adapter
- Tube rings with CGE style dovetail bar
- Aluminum foam lined case
- 43mm image circle
- OTA Weight: 22lbs.
- OTA Length: 31.5″ Extended and 27.375″ Retracted
- Back focus: 75mm
Description
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 8 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.
Specifications
| Optical Info | |
|---|---|
| Optical Design | ED Triplet Refractor |
| Lens Coatings | Fully Multi-Coated |
| Glass Type | BK7 (2)/FPL-53(ED) |
| Primary Aperture (mm) | 120 |
| F/Ratio | 7 |
| Focal Length (mm) | 840 |
| Observational Info | |
| Dawes Limit | 0.97 |
| Rayleigh Limit | 1.16 |
| Limiting Mag. | 12.9 |
| Minimum Magnification | 17 |
| Maximum Magnification | 236 |
| Light Gathering (compared to next size down) | 44% |
| General Info | |
| Focuser | 3.4" Dual Speed R&P |
| OTA Length (Retract/Ext.) | 27.4"/31.5" |
| OTA Outer Diameter | 6.875" |
| OTA Weight (with accessories) | 22 lbs |
| Accessories | |
| Included Finder | 8x50 RACI |
| Included Diagonal | 2" Dielectric |
| Mounting Accessories | Rings/D-Rail |
| Included Eyepieces | None |
| Included Case | Yes |
| Corrector | Yes |