Atlas 10 EQ-G Reflector Telescope & GoTo Controller

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Orion Atlas 10 EQ-G Reflector Telescope with GoTo Controller

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This telescope's big 10" optics and precision engineered equatorial mount will show you what big-aperture performance is all about
The Atlas 10 EQ-G reflector features an expertly figured 254mm (10") parabolic mirror of 1200mm focal length (f/4.7) for breathtaking views
The Atlas EQ-G mount's GoTo computerized database provides automated motorized access to 42,900 celestial objects
The robust Atlas EQ-G mount provides stable support for the heavy optical tube and added accessories
Includes 9x50 finder scope, 2" Crayford-style focuser, 1.25" 25mm Sirius Plossl, Starry Night astronomy software, and more!

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Item # 24735

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Nights under the stars will never be quite the same with the Orion Atlas 10 EQ-G GoTo Reflector Telescope. They’ll be much, much more rewarding. This scope’s huge 10" optics and precise, heavy-duty computerized GoTo mount will show you what big-telescope performance is all about.

It starts with the optics. The Atlas 10 EQ-G features an expertly figured 254mm (10") parabolic mirror with a 1200mm focal length (f/4.7) for big, very bright views. You’ll soon find yourself grinning ear to ear as your eyes take in beautifully bright views of elusive deep space objects that smaller aperture instruments simply cannot detect. Not to mention the breathtaking scenes the Orion Atlas 10 EQ-G GoTo Reflector will display of the Moon and planets of our solar system. The 2" Crayford-style focuser adjusts smoothly without backlash for precise performance and has a 1.25" adapter to accommodate either size of telescope eyepiece. A 1.25" 25mm Sirius Plossl telescope eyepiece comes standard, as does a nice, bright 9x50 finder scope to help aim this colossal reflector telescope.

Then there’s the telescope mount. The capable Atlas EQ-G provides rock-solid stable support and computerized GoTo control, courtesy of dual internal stepper motors that slew the scope at up to 3.4° per second and track with exceptionally low periodic error. Using the handheld GoTo controller lets you visit any of over 42,000 celestial objects with pushbutton ease. The Atlas EQ-G mount features backlash compensation in both axes and programmable periodic error correction (PEC) to provide the precision required for astrophotographic guiding with a dedicated autoguider and there’s even an ST-4 autoguider port built right into the drive base. The adjustable-height Atlas tripod has large 2"-diameter stainless steel tubular legs, making for a highly sturdy support system.

You will need an external 12-volt DC power supply or an AC-to-DC adapter to run off of 110-volt AC, such as an Orion Dynamo Pro (sold separately).

For owners of the Atlas EQ-G GoTo Mount whose version of the GoTo hand controller is 3.0 or greater, the GoTo hand controller’s firmware can be updated over the internet.

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.

Warning

Please note this product was not designed or intended by the manufacturer for use by a child 12 years of age or younger.

Product Support

Visit our product support section for instruction manuals and more

Specs

Best for viewing

Brighter deep sky
Best for imaging

Deep sky
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.

Advanced
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.

Reflector
Finder scope magnification

9x
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.

254mm
Finder scope lens diameter

50mm
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.

1200mm
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/4.7
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.

Parabolic
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.

Low thermal expansion glass
Eyepieces

Sirius Plossl 25.0mm (1.25")
Magnification with included eyepieces

46x
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.

0.46arc*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.

40x
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.

300x
Highest theoretical magnification

600x
Limiting stellar magnitude

Limiting stellar magnitude

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

13.8
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

9x50
Focuser

2" Crayford
Secondary mirror obstruction

3mm
Secondary mirror obstruction by diameter

25%
Secondary mirror obstruction by area

6%
Mirror coatings/over-coatings

Aluminum & Silicon Dioxide
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
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
Computerized compatibility

Computerized compatibility

Some mounts are compatible with a motorized Go-To system for fully automated computer finding of objects in the night sky. Others mounts are compatible with computer finding systems which require the user to manually move the mount to the object's position as indicated by the computer finder.

Go-To 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 - 2A (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
Backlash compensation

Yes
Setting circles

Yes
Polar-axis scope

Included
Counterweights

Three 11 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
Tube material

Steel
Tripod material

Steel
Tripod leg diameter

2.00 in.
Counterweight bar length

11 in.
Diameter of counterweight shaft

18mm
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.

40.00 in. - 61.50 in.
Length of optical tube

47.8 in.
Weight, optical tube

27.2 lbs.
Weight, mount/tripod

54.0 lbs.
Weight, fully assembled

117.0 lbs.
Additional included accessories

Integrated Dec. and R.A. motor drives, GoTo hand controller, Collimation cap
Other features

Pyrex primary mirror, Open-ventilation mirror cell, Polar-alignment scope
Warranty

One year

In the Box

Orion Atlas 10 EQ-G 10" reflector telescope Optical Tube Assembly
25mm Orion Sirius Pl�ssl telescope eyepiece (1.25")
Orion 2" - 1.25" telescope eyepiece adapter
Tripod
Orion Atlas EQ-G GoTo equatorial mount
Computerized object hand controller
Orion 9x50 finder scope
Dovetail finder telescope base
Collimation cap
Camera Adapter
Tube rings
Tube ring mounting plate
11 lb counterweights
Counterweight shaft
Tripod accessory tray
Dust cap
12V DC power cable
GoTo hand controller cable for Sirius EQ-G
GoTo hand controller cable for Atlas EQ-G
GoTo hand controller bracket
Computer interface cable (RS-232)
Wire clip
Starry Night special edition software

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: $415.00
2 Day Delivery: $415.00
Next Day Delivery: $532.00

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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.

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Why Buy From Orion

Advanced

User level

Optical design

Optical diameter

Focal length

Focal ratio

Optics type

Glass material

Resolving power

Lowest useful magnification

Highest useful magnification

Limiting stellar magnitude

Optical quality

Astro-imaging capability

Dovetail bar system

Computerized compatibility

PEC

GPS

Available ports

Height range of mount

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