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URL: http://www.thaiexcite.com/Sky-Watcher-Evostar-72ED-Apo-Refractor.html
กล้องดูดาว Sky-Watcher Evostar 72ED Apo Refractor
รายละเอียด
รายละเอียด
กล้องดูดาว Sky-Watcher Evostar 72ED Apo Refractor
- Doublet apochromatic optical design
- Two-element, air-spaced optical assembly minimizes false color
- 72mm aperture, 420mm focal length, f/5.8 focal ratio
- 2-inch dual-speed Crayford-style focuser
- Aluminum tube coated with glossy, black diamond metal-flake finish
- Included accessories: tube rings, a Vixen-style dovetail and a foam-lined aluminum case
Sky-Watcher’s Evostar apochromatic doublet refractors are the perfect blend of superior extra-low dispersion glass and affordability. The Evostar refractor lens assembly utilizes a proprietary combination of matched lenses, delivering tack-sharp stars with charcoal-black, contrast-rich skies.
All ED glass elements are fluorite-based and feature our proprietary Metallic High-Transmission Coatings™ (MHTC™), virtually eliminating all false color while the internal baffle helps prevent stray light from affecting your photography.
Like the optics, the tube is beautifully crafted using aluminum and finished with a black diamond metal-flake finish.
Using a doublet refractor instead of a triplet has some advantages: less glass means less weight, less weight means a less expensive telescope, so you can dedicate more money for your camera or laptop while benefiting from a lightweight astrophotography rig.
The Evostar 72ED comes in a foam-lined aluminum case with tube rings and a V-style dovetail plate.
SPECIFICATIONS
| Optical Info | |
|---|---|
| Optical Design | ED Doublet |
| Lens Coatings | Fully Multi-Coated |
| True Aperture (mm) | 72 |
| Primary Aperture (mm) | 72 |
| F/Ratio | 5.9 |
| Focal Length (mm) | 420 |
| Observational Info | |
| Dawes Limit | 1.61 |
| Rayleigh Limit | 1.94 |
| Limiting Mag. | 11.7 |
| Minimum Magnification | 10 |
| Maximum Magnification | 142 |
| General Info | |
| Focuser | 2" Dual Speed Crayford |
| OTA Length (Retract/Ext.) | 16.5" |
| OTA Outer Diameter | 3.5" |
| OTA Weight (with accessories) | 4.3 |
| Accessories | |
| Mounting Accessories | Rings/V-Rail |
| Included Case | Yes |
| Corrector | No (optional) |
SUPPORT DOCUMENTS
Manuals:
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About Sky-Watcher
Sky-Watcher was launched in 1999 featuring a modest line of Newtonian and refractor optical tubes, with distribution in Europe and Asia. In 2000, Sky-Watcher released their first series of Dobsonian telescopes, and two years later answered the rising popularity of digital SLRs with their first version of the famed German Equatorial Mount, the EQ6. Today, with a full product line that includes Dobsonians, APO refractors, EQ mounts, and photography products, Sky-Watcher has grown into the most popular telescope brand worldwide.