Orion SkyView Pro EON 80mm ED GoTo Apo Refractor | Orion Telescopes and Binoculars

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Orion SkyView Pro EON 80mm ED GoTo Apo Refractor

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Exquisite 80mm apo refractor for wide-field observing, on a SkyView Pro GoTo mount
80mm f/6.25 doublet lens crafted with ED glass, which eliminates chromatic aberration
Beautifully machined Dual-speed Crayford-style 2" focuser has zero image shift, 11:1 micro-focusing
The SkyView Pro EQ mount's computerized GoTo system locates and tracks 42,900 objects
Includes 8x40 finder, 2" enhanced mirror diagonal, 2" 32mm Q70 and 1.25" 10mm Plossl eyepieces

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Item # 24778

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Astronomers looking for a nicely portable, wide-field telescope on a mid-sized GoTo mount need look no further than the Orion SkyView Pro EON 80ED GoTo Telescope. It embodies the optical quality and ease-of-use functionality that will keep you coming back for more on every clear night.

The EON 80ED's 500mm focal length (f/6.25) provides a wide field of view that puts nebulas, star clusters, and galaxies in the context of their surrounding stellar background. The 80mm air-spaced doublet telescope lens is crafted with one element of FPL-53 extra-low dispersion, "ED", optical glass, which virtually eliminates the effects of chromatic aberration. Views of the planets, Moon, and bright stars will be delightfully free of color fringing, unlike in standard refractors telescopes. All air-to-glass lens surfaces are fully multi-coated for maximum light throughput.

Getting around the sky couldn't be easier with the SkyView Pro GoTo mount. The GoTo system consists of a computerized hand controller with backlit LCD screen and two high-precision stepper motors that move the telescope quickly and quietly to the chosen target. With intuitive menus and illuminated pushbutton controls, the GoTo system locates and tracks any celestial object in its database of 42,900 objects, including the entire Messier and NGC catalogs. You can take a guided tour of the night sky and visit the current month's best objects.

Warranty

Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at 800-676-1343.

Product Support

Visit our product support section for instruction manuals and more

Specs

User level

User level

Beginner - Suited for a wide range of uses, Level 1 telescopes are simple to operate and set up. Some initial assembly may be required. Very good optical and mechanical quality. Great for families, young people, and folks who don't want to mess with equipment but just want to take a look. Any of these scopes will show you countless lunar craters, Saturn's rings and a myriad of star clusters and nebulas! Referring to the manual is recommended.

Intermediate - These scopes offer higher performance and more advanced features than Level 1 models. They typically take a bit longer to learn and need some set-up or adjustments. But anyone with the slightest technical bent will have no problem getting familiar with these models. Referring to the manual is recommended.

Advanced - These scopes provide the best performance but may require more skill to master and appreciate. They have exceptionally fine optics and mechanics. Some are easy to use but are but on the large or heavy side. Some are intended for specialized uses. These scopes will appeal to the more technically inclined. Referring to the manual is highly recommended.

Expert - Expert telescopes offer uncompromising optical and mechanical quality for the most demanding amateur astronomer. They may be technically involved or designed for specialized use, such as astrophotography or detailed deep sky observation. They carry a premium price, but are designed to provide the ultimate performance in the field. Referring to the manual is highly recommended.

Intermediate
Optical design

Optical design

Reflector telescopes use a pair of large and small mirrors to direct incoming light to the eyepiece. Refractor telescopes refract, or "bend" incoming light to a focus by means of an objective lens. Cassegrain telescopes, such as Maksutov-Cassegrains, "fold" incoming light using two mirrors and a front "corrector" lens.

Refractor
Optical diameter

Optical diameter

The optical diameter (also known as aperture), is the size of the telescope's main light collecting lens or mirror, measured in millimeters or inches. As the diameter increases, more light is collected and the resolution increases.

80mm
Focal length

Focal length

The focal ratio of an optical system is the ratio of a telescope's focal length to its aperture. Short focal ratios (f/5, f/4.5) produce wide fields of view and small image scales, while long focal lengths produce narrower fields of views and larger image scales.

500mm
Focal ratio

Focal ratio

The focal ratio of an optical system is the ratio of a telescope's focal length to its aperture. Short focal ratios (f/5, f/4.5) produce wide fields of view and small image scales, while long focal lengths produce narrower fields of views and larger image scales.

f/6.2
Coatings

Coatings

Lenses are coated with an antireflective material to ensure that as little light as possible is reflected away, so more gets to your eye. Good lenses are at least "fully coated," with a single layer of magnesium fluoride applied to each air-to-glass lens surface. Multiple layers of coatings are even more effective; the term "multi-coated" means one or more lens surfaces have multiple coatings. "Fully multi-coated" is even better, meaning that all lens surfaces are multiple-layer coated. Mirror star diagonals are coated with a reflective material similar to telescope mirrors in order to reflect the light into the eyepiece. Standard aluminum coatings reflect between 88%-92%, and enhanced aluminum reflects 97%. Dielectric coatings use a different process to deposit a coating that reflects 99% of the light. In addition to the higher reflectivity, Dielectric coatings are much more durable than aluminum coatings, so they last longer and can be cleaned with less risk of damage.

Fully multi-coated
Optics type

Optics type

Newtonian reflectors will have either a spherical shaped mirror, which is less expensive to produce, or a higher quality parabola, which does not result in spherical aberration. Cassegrain telescopes routinely use spheres in addition to other lenses in the optical path to correct for residual spherical aberration. Refractors use a series of lenses to provide a clear image. Designs range from a standard air-spaced doublet (two lenses in a row) to exotic designs such as oil-spaced triplets and 4-element multi group lenses.

Air-spaced doublet
Glass material

Glass material

Refractors use glass lenses to focus the light, and the glass material plays an important role in the quality of the resulting image. Standard achromatic refractors routinely use Crown and Flint for the two elements, but more expensive apochromatic refractors can use ED (extra low dispersion) glass for one or more of the lenses. Reflector mirrors are made from glass with different levels of thermal expansion. Standard mirrors are made from material such as Soda-Lime Plate glass and BK-7 glass. Glass with Pyrex or other low thermal expansion material will not change shape as dramatically during the cool-down period, resulting in more stable images during this period.

Extra low dispersion FPL-53
Eyepieces

3-Element 32.0mm (2"), 10.0mm (1.25")
Magnification with included eyepieces

15x, 50x
Resolving power

Resolving power

The theoretical resolving power of a telescope can be calculated with the following formula: Resolving power (in arc seconds) = 4.56 divided by aperture of telescope (in inches). In metric units, this is: Resolving power (in arc seconds) = 116 divided by aperture of telescope (in millimeters). Note that the formula is independent of the telescope type or model, and is based only upon the aperture of the telescope. So the larger the telescope's aperture, the more it is capable of resolving. This is important to keep in mind when observing astronomical objects which require high resolution for best viewing, such as planets and double stars. However, it is usually atmospheric seeing conditions (not the telescope) which limits the actual resolving power on a given night; rarely is resolution less than one arc-second possible from even the best viewing locations on Earth.

1.45arc*sec
Lowest useful magnification

Lowest useful magnification

Lowest useful magnification is the power at which the exit pupil becomes 7mm in diameter. Powers below this can still be reached with the telescope to give wider fields of view, but the image no longer becomes brighter at a lower power. This is due to the fact that the exit pupil of the telescope (the beam of light exiting the eyepiece) is now larger than the average person's dark adapted pupil, and no more light can fit into the eye.

12x
Highest useful magnification

Highest useful magnification

The highest practical limit is different from the often used "highest theoretical magnification" specification. The "theoretical" limit generally is 50x the aperture of the scope in inches (2x the aperture in mm). So for example, an 80mm refractor is capable of 160x, and a 10" telescope is theoretically capable of 500x magnification. But after approximately 300x, theory breaks down and real world problems take over. The atmosphere above us is constantly in motion, and it will distort the image seen through the telescope. This effect may not be noticeable at lower powers, but at higher powers the atmosphere will dramatically blur the object, reducing the quality of the image. On a good night (a night where the air above is steady and the stars aren't twinkling), the practical upper limit of a large telescope is 300x, even thought the theoretical limit may be much higher. This doesn't mean the scope will never be able to reach those higher "theoretical" powers - there will be that rare night where the atmosphere is perfectly still and the scope can be pushed past it's practical limit, but those nights will be few and far between.

160x
Highest theoretical magnification

160x
Limiting stellar magnitude

Limiting stellar magnitude

The limiting stellar magnitude is a measure of the faintest star you can see through the telescope.

12.2
Optical quality

Optical quality

"Diffraction Limited" means that the limits of image detail are determined by the physical properties of light, and not by optical defects in the telescope.

Diffraction limited
Finder scope

8x40
Focuser

2" dual-speed Crayford
Diagonal degrees

2" 90° Mirror Star
Mount type

Equatorial
Astro-imaging capability

Astro-imaging capability

The astro-photographic capability of the telescope is based on the style, stability, and accuracy of the mount and tripod. Telescopes on either very lightweight mounts or non tracking mounts (such as Dobsonians) are capable of only very short exposures such as lunar photographs. If a motor drive is attached to an equatorial mount, even a small lightweight mount is capable of capturing some planetary detail. Larger EQ mounts that utilize very precise tracking and excellent stability are capable of longer exposure deep-sky photography.

Lunar, planetary & long exposure
Weight rating

Weight rating

The weight rating is a measure of how much the mount can handle before vibration become excessive. This specification is dependent on the shape of the telescope. For example, if you have two telescopes that both weigh 15 lbs., but one is a Cassegrain with a very short tube and the other is a very long focal length refractor, the Cassegrain will be more stable due to the fact that the tube itself is much shorter. The extra length of the refractor tube acts as a "lever arm" and vibrations become much more prominent. So be careful as you approach the weight capacity limit that you don't overload the mount with a very long tube.

20 lbs.
Dovetail bar system

Dovetail bar system

A universal attachment system for holding the optical tube onto the tripod. A dovetail bar is attached to the tube rings, then it slides onto the mount itself, making for quick assembly and disassembly.

Yes
Motor drive compatibility

Motor drive compatibility

A motor drive automatically moves the telescope in right ascension at the same rate as the east-west drift of the stars so stars can be continuously tracked in the eyepiece without manual adjustment. Motor drives are usually equipped with a hand control that allows the telescope's tracking speed to be slightly increased or decreased, which is particularly critical when taking long-exposure astro-images.

Clock drive included
Alignment procedure

3-Star Alignment, 2-Star Alignment, 1-Star Alignment
Number of objects in database

42,000+
Tracking rates

Sidereal, Solar and Lunar
Motor speeds

3.4°/sec, 600x, 500x, 400x, 64x, 32x, 16x, 8x, 2x, 1.75x, 1.5x, 1.25x
Motor type

Microstep driven 1.8°stepper motors
Bearing material

Sealed ball bearings
Power requirement

12-volt DC (tip positive)
PEC

PEC

Periodic errors are inherent in almost all worm gears due to slight eccentricities and misalignments. PEC (Periodic Error Correction) training function provides a manual correcting method to reduce the amplitude of the worm gear errors. By recording a full cycle of guiding actions, the mount can compensate for drifting in the R.A. sidereal tracking caused by periodic errors. The PEC training function is recommended for advanced users with interest in long-exposure astrophotography only. Standard sidereal tracking is sufficient for all casual visual applications, and PEC training is not required. Also, PEC is typically not used in conjunction with an autoguider.

Yes
GPS

GPS

A GPS module automatically sets the date and exact time and location for the mount, relieving the user from the need to look up coordinates on a map or manually enter perfect time. This can be very beneficial when traveling with the scope as locations can quickly be automatically entered into the hand control.

Sold separately
Latitude range

Latitude range

The latitude range refers to the usable range on the EQ mount's latitude axis. If you live above or below the latitude specified, the mount may not be able to polar align properly because of interference with the counterweight shaft or the polar axis housing.

9-72
Setting circles

Yes
Polar-axis scope

Sold separately
Counterweights

One 7.5 lb.
Available ports

Available ports

Ports allow the mount to connect to devices such as autoguiders (for long exposure photography without tedious manual guiding), PC's running planetarium software (via the RS-232 port) and GPS receivers (through the Aux port).

RS-232, autoguider
Tripod material

Steel
Tripod leg diameter

1.75 in.
Counterweight bar length

10 in.
Diameter of counterweight shaft

20mm
Height range of mount

Height range of mount

The height range specification is a measure of the tripod itself - not the eyepiece height. Since telescopes come in all shapes and sizes, the eyepiece height will vary, even when using the same tripod. For an EQ tripod the mount is set up so the counterweight shaft is horizontal, and then the height is measured from the ground to the center of the mounting plate.

42.25 in. - 55.00 in.
Weight, optical tube

6.5 lbs.
Weight, mount/tripod

36.5 lbs.
Weight, fully assembled

50.5 lbs.
Warranty

One year

In the Box

Orion EON 80mm Extra-Low Dispersion Apochromatic Refractor Telescope optical tube assembly
Dust cover
1.25" eyepiece adapter
2.5mm hex key
Hard carrying case for optical tube assembly
Tripod
Tripod support tray
�SkyView Pro Equatorial mount
�Latitude adjustment L-bolt
�Tube ring mounting plate
�Counterweight shaft
�Large counterweight
�Small counterweight
2 Slow-motion control knobs
�Polar axis finder scope cover
�Declination (Dec.) GoTo motor assembly
�Right ascension (R.A.) GoTo motor assembly
2 Brass gears w/ 2mm socket-head set screws
�Motor control box
�Motor control box bracket
�SkyView Pro GoTo hand controller
�GoTo hand controller cable (coiled, 30")
�GoTo hand controller bracket
�Motor Cable (13"): motor control box-to-R.A. motor
�Motor Cable (27"): R.A. motor-to-Dec. motor
�Hand controller-to-PC cable (5?)
�12V DC power cable
�Declination (Dec.) motor cover
�Right ascension (R.A.) motor cover
�Right ascension (R.A.) motor attachment screw
�Declination (Dec.) motor attachment screw
Phillips screw (10mm length)
2 Phillips screws (8mm length)
2 Flat washers, 10mm outer diameter
Lock washer, 9mm outer diameter
4mm hex key
2mm hex key
Phillips screwdriver
8x40 finder scope
2" Mirror Star Diagonal
32mm Q70 2" telescope eyepiece

Shipping Info

Orders received by noon Pacific Time for in-stock items ship the same business day. Orders received after noon will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

A per-item shipping charge (in addition to the standard shipping and handling charge) applies to this product due to its size and weight. This charge varies based on the shipping method.

Standard Delivery: $0.00
3 Day Delivery: $97.00
2 Day Delivery: $97.00
Next Day Delivery: $118.00

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About Orion Telescopes & Binoculars

Since 1975 Orion Telescopes & Binoculars has been offering telescopes for sale direct to customers, with an unswerving commitment to best quality products, value and unmatched customer care. Our 100% satisfaction guarantee says it all.

Orion offers telescopes for every level: Beginner, Intermediate, Advanced, and Expert. From our entry level beginner telescopes for amateur astronomers to our Dobsonian telescopes to our most advanced Cassegrain telescopes and accessories, you can find the best telescope for you. And you'll enjoy discount prices by buying your telescope online, direct from Orion. Not sure how to choose a telescope? Orion's Telescope Buyer's Guide is a great place to start.

Orion binoculars are known for quality optics at a great price. We offer binoculars for every viewing interest, including astronomical binoculars, compact binoculars, waterproof binoculars, birding binoculars, and sport and hunting binoculars.

Orion's telescope and astrophotography accessories will enhance your telescope enjoyment without breaking the bank. Expand your viewing experience with accessories ranging from moon filters to power-boosting Barlow lenses to advanced computerized telescope mounts. Capture breathtaking photos with our affordable astrophotography cameras. And when you're stargazing, Orion's telescope cases and covers, observing gear, red LED flashlights, astronomy books and star charts will make your observing sessions more convenient, comfortable and meaningful.

At Orion, we are committed to sharing our knowledge and passion for astronomy and astrophotography with the amateur astronomy community. Visit the Orion Community Center for in-depth information on telescopes, binoculars, and astrophotography. You can find astrophotography "how to" tips and share your best astronomy pictures here. Submit astronomy articles, events, and reviews, and even become a featured Orion customer!

Why Buy From Orion

Intermediate

User level

Optical design

Optical diameter

Focal length

Focal ratio

Coatings

Optics type

Glass material

Resolving power

Lowest useful magnification

Highest useful magnification

Limiting stellar magnitude

Optical quality

Astro-imaging capability

Weight rating

Dovetail bar system

Motor drive compatibility

PEC

GPS

Latitude range

Available ports

Height range of mount

Why Buy From Orion

Why Buy From Orion

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