EvoStar 80ED Doublet APO Refractor Sky-Watcher

• 80 mm apochromatic Refractor with Schott BK-7 and FPL-53 ED glass
• 600 mm focal length (f/7.5)
• Dual-speed 2″ Crayford-type focuser with 1.25″ adaptor
• 8×50 RA erect-image finderscope
• 2″ dielectric diagonal
• 20 mm and 5 mm 1.25″ eyepieces
• Includes M42 t-adapter for attaching your camera
• Tube-ring attachment hardware and Aluminum carry case

Description

Sky-Watcher EvoStar 80ED APO Refractor: Portable Optical Powerhouse!
Due to their unobstructed textbook-like diffraction patterns and exotic optical properties, the ED-APO produces the sharpest, highest quality imaging obtainable from any telescope optical design.  These breathtakingly pristine celestial views are coveted by experienced amateur astronomers.

Observing with SW EvoStar 80ED 80 mm Refractor
The Sky-Watcher ED-APO 80mm is a modestly wide-field telescope offering bright, wide swaths of sky in a single view.  It is well suited for wide-field astronomical observation of prominent nebulae, star clusters and galaxies from a dark-sky location, or can be used as an astrograph for photography. 

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 EvoStars come with 2-speed backlash-free 2” Crayford-style focusers and quality foam-lined metal carrying cases as standard equipment. EvoStar s 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; an M42-sized t-adapter for attaching your camera; and tube ring attachment hardware that works with compatible mounts.

Specifications

Optical Info
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
Observational Info
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%
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	8×50 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)