
Sky-Watcher EvoStar 80ED APO Refractor Telescope OTA (S11100)
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 colour while dual-baffles 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.
Description
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 80ED comes in a foam-lined aluminum case fully loaded with accessories, including: 2-inch Crayford-style focuser, 2-inch dielectric diagonal, two 1.25-inch eyepieces (5mm and 25mm), an 8x50 right-angle finderscope, tube rings, and a V-style dovetail.
Quick Overview
- Doublet apochromatic optical design
- Two-element, air-spaced optical assembly minimizes false colour
- 80mm aperture, 600mm focal length, f/7.5 focal ratio
- 2-inch dual-speed Crayford-style focuser
What's in the Box
- Aluminum tube coated with glossy, black diamond metal-flake finish
- Two 1.25-inch eyepieces
- 2-inch Crayford-style focuser
- Tube rings
- V-style dovetail
- 8x50 right-angle finderscope
- 2-inch dielectric diagonal
- Foam-lined aluminum case
Specifications
Optical Info | |
Optical Design | ED Doublet |
Lens Coatings | Fully Multi-Coated |
Glass Type | BK7/FPL-53(ED) |
True Aperture (mm) | 8000% |
Primary Aperture (mm) | 80 |
F/Ratio | 7.5 |
Focal Length (mm) | 60000% |
Observational Info | |
Dawes Limit | 145% |
Rayleigh Limit | 1.75 |
Limiting Mag. | 12 |
Minimum Magnification | 11 |
Maximum Magnification | 157 |
Light Gathering (compared to next size down) | 24% |
General Info | |
Focuser | 2" Dual Speed Crayford |
OTA Length (Retract/Ext.) | 22.5" |
OTA Outer Diameter | 4.5625" |
OTA Weight (with accessories) | 7.3 |
Accessories | |
Included Finder | 8x50 RACI |
Included Diagonal | 2" Dielectric |
Mounting Accessories | Rings/V-Rail |
Included Eyepieces | 25mm LET/5 Planetary |
Magnification w/ Included Eyepieces | 30x/120x |
Included Case | Yes |
Corrector | No (optional) |