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The Sky-Watcher EvoStar 80ED APO Refractor is 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 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.
Using a doublet refractor instead of a triplet has some advantages: less glass means less weight, less weight means a less expensive optic, 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.
Optical Design | ED Doublet |
Lens Coatings | Fully Multi-Coated |
Glass Type | BK7/FPL-53(ED) |
True Aperture (Mm) | 80 |
Primary Aperture (Mm) | 80 |
F/Ratio | 7.5 |
Focal Length (Mm) | 600 |
Dawes Limit | 1.45 |
Rayleigh Limit | 1.75 |
Limiting Mag. | 12 |
Minimum Magnification | 11 |
Maximum Magnification | 157 |
Light Gathering (Compared To Next Size Down) | 24% |
Focuser | 2" Dual Speed Crayford |
Ota Length (Retract/Ext.) | 22.5" |
Ota Outer Diameter | 4.5625" |
Ota Weight (With Accessories) | 7.3 |
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) |
Free Shipping | No |
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