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Sky-Watcher EvoStar 80mm Doublet APO Refractor


Sky-Watcher EvoStar 80mm Doublet APO Refractor

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$640.00  $689.00


SKU: S11100
Manufacturer: Sky-Watcher
Telescope Type: Apochromatic Refractor
Aperture (in.): 3.1 inches
Aperture (mm): 80 mm
Focal Ratio: f/7.5
Focal Length: 600 mm
Limiting Visual Magnitude: 12.1
Eyepiece 1: 20 mm
Magnification with Eyepiece 1: 30x
Eyepiece 2: 5 mm
Magnification with Eyepiece 2: 120x
Accepts 2-inch Eyepieces: Yes
Focuser Type: Dual-speed Crayford
Focuser Size: 2-inch
Finder: 8 x 50 optical right angle
Star Diagonal: 2-inch dielectric mirror

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The Sky-Watcher Pro 80ED is an affordable doublet APO refractor that includes tube rings, Vixen dovetail bar, finder scope and two eyepieces. Due to their unobstructed textbook-like diffraction patterns and exotic optical properties, the ED-APO refractor produces the sharpest, highest quality image obtainable from any telescope optical design. These breathtakingly pristine celestial views are coveted by experienced amateur astronomers.

Virtually Eliminates Residual Chromatic Aberration 
The Sky-Watcher ED-APO design assures virtual elimination of residual "false color" (i.e. chromatic aberration) normally present in 2-element achromatic lens designs which utilize standard crown and flint glasses. Sky-Watcher APO refractors utilize the finest extra-low dispersion (ED) glass available, FPL-53. This results in the best color correction for an ED doublet lens.

Schott Glass Used for Front Crown Element and ED 2 Lens Element
The P80ED will benefit from the inclusion of Schott glass being used for the positive front Crown element in the objective.  Schott is the recognized world leader in glass utilized for precision optical lens systems, including medical instrumentation and famous-brand camera lenses. While Schott glass is only used in selected models, all other models utilize top-quality, Grade-A glass from perhaps less famous but, nonetheless, highly respected, high-quality glass manufacturers.

Pride and Perfection in Optical Manufacturing
Every lens element is individually inspected for purity and absence of striae and other image-degrading imperfections.  Every lens is pitched polished to exacting standards of optical fabrication and performance by highly skilled opticians utilizing state-of-the-art methodology and rigidly controlled optical testing procedures.  The result is high-quality, diffraction-limited optics performing to the theoretical limits of their respective aperture sizes.  All lenses are uniformly air-spaced in their cell housings.

Sky-Watcher offers one of the most extensive lines of ED-APOCHROMATIC refractors in the world. Using only the finest fabrication materials available, Sky-Watcher APO refractors are manufactured to painstakingly rigorous, exacting standards of optical and mechanical quality to insure the amateur astronomer peak performance and a great experience each and every time a Sky-Watcher ED-APO is taken into the field. We know the amateur astronomer has very high expectations regarding astronomical equipment purchases.  Sky-Watcher has been delivering consistent satisfaction for over a decade.

Metallic High-Transmission Lens Coatings
Each air-to-glass lens surface has exotic anti-reflection metallic coatings applied to ensure optimum light through-put.  The proprietary Sky-Watcher “Metallic High-Transmission Coatings" (MHC) are the finest photon anti-rejection coatings in their class.

Light-Baffled Optical Systems
The objective lens cell is light-baffled to reject stray, unfocused light.  The draw tube is likewise baffled to insure optimum contrast.  The tube interior is flat blackened to help prevent unfocused internal light reflections from reaching the focal plane.

Precision 2" Crayford-style Focuser is Standard
Optical focus is achieved by means of a mechanically ultra-smooth, backlash-free, precision 2" Crayford-style focuser-assembly with 1.25" adaptor.  Focuser offers 2 speeds for fine and ultra-fine focusing adjustments.

Tube Materials
The optical tube material is aluminum, powder-coated reflective gloss black with gold fleck accent.  The front and back cells are cast-aluminum painted white or black.

Telescope Tube Attachment Hardware
The Sky-Watcher APO optical tubes come with attachment hardware that allows them to be securely fastened to compatible mounts. The quick-release tube rings provided with SW ED-APO models 80ED, 100ED and 120ED are cast-aluminum, painted white.

Included Components for Selected Models

All Sky-Watcher USA ProEDs come with 2-speed backlash-free 2” Crayford-style focusers and quality foam-lined metal carrying cases as standard equipment. ProEDs are also supplied with right-angle 8x50mm viewfinder with bracket; 2” dielectric diagonal; two 1.25” LE (Long Eye relief) eyepieces (LET20mm and LET5mm); 1.25” focuser adaptor; and tube ring attachment hardware that works with compatible mounts.


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