6" Advanced VX Series Go-To Equatorial Refractor

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This Celestron AVX6R 6” refractor telescope has

• 6” f/8 achromatic doublet refractor optics
• Advanced VX Series computerized go-to equatorial mount and tripod
• 9 x 50mm finderscope
• 2” rack and pinion focuser with 1.25” adapter
• 20mm Plössl eyepiece (60x) with a wide 1.3° field of view
• full multicoatings for high-contrast images of both solar system and deep space objects
• 2-year warranty


This Celestron AVX6R telescope is a 6" aperture achromatic refractor optical tube on a robust go-to computerized German equatorial mount. The optics are sharp and well suited to serious deep space observing of binary stars, star clusters, and the brighter nebulas and galaxies . . . as well as the excellent high contrast planetary and lunar images for which refractors are famous. The new VX Series go-to mount makes finding and following over 40,000 of those objects easy and automatic, so you spend more of your time looking at celestial wonders, and less time looking for them.

Some chromatic aberration is visible on stars and objects brighter than 2nd or 3rd magnitude, as you would expect in an achromatic refractor with such a large aperture and fast focal ratio. However, the spurious color is well-controlled and not unreasonable, thanks to careful optical design, and has little effect on deep space observing of nebulas, galaxies, and star clusters. Most observers feel the relatively limited amount of chromatic aberration visible on the Moon and planets is a small price to pay for the scope’s many other virtues of sharpness, contrast, and optical clarity.

The scope’s lightweight optical tube and easily assembled mount make it quick to set up and enjoy – either in your back yard or at a distant dark sky site. Its superb optical quality and reasonable price for a go-to scope make it an excellent buy for the beginning and advanced astronomer alike.

This Telescope’s Optical System . . .

Achromatic refractor optical tube:
6” aperture precision ground and polished crown and flint glass doublet (1200mm focal length f/8), guaranteed to be diffraction-limited. The 51” long aluminum optical tube weighs only 19 lb (8.6 kg), making it easy to transport and assemble in the field. An aluminum dew shield reduces dewing to extend your observing time and blocks ambient light to improve your contrast. The f/8 focal ratio pairs well with Celestron Nightscape CCD cameras for imaging the brighter deep space objects, and with the Celestron NexImage 5 Solar System Imager for lunar and planetary imaging.

Multicoated optics:
High light transmission anti-reflection multicoatings are standard equipment on all air to glass surfaces.

Finderscope: 9 x 50mm straight-through achromatic design, with a wide 5.8° field of view. Focuses by loosening the trim ring behind the objective lens cell, screwing the lens cell in or out to focus, and tightening the trim ring to lock in the correct focus.

Focuser: 2” rack and pinion type, with removable 1.25” accessory adapter.

Star diagonal: 1.25” prism type. For peak performance, some observers have found that upgrading the supplied star diagonal to a premium version, such as the 99% reflectivity dielectric multicoated Astro-Tech 1.25" AT1D and 2" AT2D, pays visible dividends in sharpness and contrast during high magnification observing. A set of optional vibration suppression pads under the tripod feet will likewise improve the telescope damping time for steadier high power observing.

Eyepiece: 1.25” 20mm Plössl (60x). The eyepiece field of view is 0.83 degrees, two-thirds larger than the full Moon.

This Telescope’s Mount . . .

Heavy duty Advanced VX Series computerized go-to German equatorial mount:
  This scope’s new Advanced VX mount was specifically designed to provide optimum imaging performance for smaller telescopes (30 lbs and under). It has the imaging-friendly features of Celestron’s larger telescope mounts, such as permanent periodic error correction (PPEC) and the ability to Image across the meridian without doing a meridian flip, so you can seamlessly image the best part of the night sky.

Experienced imagers will love taking this portable mount to a dark sky site (the head weighs only 17 lbs, the tripod only 18 lbs, plus two 11 lb counterweights), as it provides all the performance of their larger observatory mounts in a portable package. If you’re new to imaging, the Advanced VX mount will help you get started with the hobby and keep up with your needs for years to come.

The mount includes dual-axis slewing/tracking low-cog DC servo motors with positioning encoders on each axis for go-to computer control. The new motors provide improved tracking performance and more power to handle an unbalanced load than previous Advanced Series drives. Built-in adjustable backlash compensation and permanent user-programmed periodic error correction (PPEC) permits precise corrections during astrophotography and when observing visually at high powers. The maximum slewing speed is a fast 4° per second.

The scope is supplied with a car battery cord to operate from the cigarette lighter plug of your car or from a rechargeable 12V battery pack. The mount requires a 12VDC 3.5A power source, so the Celestron 17 amp hour capacity Power Tank #4517V is recommended for extended use in the field. The Power Tank can be recharged hundreds of times and will operate the scope all night long without danger of running out of power. Celestron AC adapter #2338PRO is also available to operate the scope from household AC in your back yard.

The three sliding 11 pound counterweights are locked in place with a single hand-tighten thumbscrew each, making it easy to rebalance the scope if you add heavy photographic accessories. The mount is easily capable of handling the scope and any reasonable combination of photographic accessories you might want to use. Snap-on covers keep the motor drives free from dust and debris. A set of optional vibration suppression pads #4525 under the tripod feet will improve the telescope damping time for steadier high power observing.

To make a casual polar alignment for visual use quick and easy, there’s a latitude scale and fine adjustment controls in both altitude and azimuth. The scope can be used over a wide 7° to 77° latitude range in both the northern and southern hemispheres. The scope includes Celestron’s unique All-Star computerized polar alignment that lets you do an accurate polar alignment even when Polaris is hidden by trees or buildings.

NexStar+ computer hand control: The supplied NexStar+ computerized hand control has an internal clock and a built-in database of more than 40,000 stars and deep space/solar system objects it can find for you. These include the complete RNGC, Messier, Caldwell, IC, and Abell catalogs; selected SAO stars, such as variables and multiple star systems; the planets, the Moon, and more. There is enhanced information on over 200 of the most note-worthy objects.

You can also store and edit the right ascension and declination of 100 additional user-defined objects of your own choosing, such as the comet and asteroid coordinates published monthly in Astronomy and Sky & Telescope magazines. The computer control can find any of those objects with at your command, and accurately track them for visual or photographic application.

All of the database and telescope operation information is displayed on a double line, 16-character, liquid crystal display on the hand control. The NexStar+ hand control offers multiple language programming (English, French, Italian, German, Spanish). There are 19 fiber optic back-lit LED buttons to make it easy for you to control the computer without affecting your dark adapted vision. There are two AUX ports, an autoguider port, and an RS-232 communication port on the hand control that allows you to operate the telescope via a personal computer. The computer hand control software can be upgraded over the Internet from Celestron's website, assuring that you always have the most current software version at your command.

Several different alignment methods are built into the NexStar+ computer, allowing you to choose a level of computer accuracy in automatically finding objects with which you are comfortable. You can choose two-star align, quick align, one-star align, last alignment, or solar system align. Each of these computer-guided alignment methods is easily accomplished in only a few short minutes. You can be observing in less than 15 minutes after you first take your scope outdoors, including telescope assembly time.

In addition, the NexStar+ computer hand control is GPS-compatible (using an optional inexpensive SkySync GPS module) for full GPS (Global Positioning System) satellite accuracy. Adding GPS to the computer is something no competitive scope can do. With the Advanced VX Series go-to mount and the SkySync, orienting the scope in time and space on earth and aligning the scope on the sky becomes almost as easy as simply turning the scope on.

Adjustable height tripod: The tripod has 2” diameter steel legs with a center leg brace for rigidity, with excellent damping characteristics. The center leg brace is drilled to form a convenient accessory tray that holds 1.25" and 2" eyepiece to keep them up out of the dew-soaked grass.

Dovetail slide bar: An adjustable Vixen-style dovetail slide bar allows the optical tube to be quickly and precisely balanced fore and aft on the mount, eliminating the need for an extra counterweight to balance a camera or other accessories. Setup and takedown times are exceptionally fast, as a single large hand-tighten knob holds the optical tube in place. A second lock knob prevents the tube from sliding off the mount should the hand-tighten knob loosen.

Two-year warranty: All Celestron go-to telescopes have a two-year warranty, double that of competitive go-to scopes.


Supplied Eyepiece:
The eyepiece that is supplied with this telescope.
Highest Useful Magnification:
This is the highest visual power a telescope can achieve before the image becomes too dim for useful observing (generally at about 50x to 60x per inch of telescope aperture). However, this power is very often unreachable due to turbulence in our atmosphere that makes the image too blurry and unstable to see any detail.

On nights of less-than-perfect seeing, medium to low power planetary, binary star, and globular cluster observing (at 25x to 30x per inch of aperture or less) is usually more enjoyable than fruitlessly attempting to push a telescope's magnification to its theoretical limits. Very high powers are generally best reserved for planetary observations and binary star splitting.

Small aperture telescopes can usually use more power per inch of aperture on any given night than larger telescopes, as they look through a smaller column of air and see less of the turbulence in our atmosphere. While some observers use up to 100x per inch of refractor aperture on Mars and Jupiter, the actual number of minutes they spend observing at such powers is small in relation to the number of hours they spend waiting for the atmosphere to stabilize enough for them to use such very high powers.
300x
Visual Limiting Magnitude:
This is the magnitude (or brightness) of the faintest star that can be seen with a telescope. The larger the number, the fainter the star that can be seen. An approximate formula for determining the visual limiting magnitude of a telescope is 7.5 + 5 log aperture (in cm).

This is the formula that we use with all of the telescopes we carry, so that our published specs will be consistent from aperture to aperture, from manufacturer to manufacturer. Some telescope makers may use other unspecified methods to determine the limiting magnitude, so their published figures may differ from ours.

Keep in mind that this formula does not take into account light loss within the scope, seeing conditions, the observer’s age (visual performance decreases as we get older), the telescope’s age (the reflectivity of telescope mirrors decreases as they get older), etc. The limiting magnitudes specified by manufacturers for their telescopes assume very dark skies, trained observers, and excellent atmospheric transparency – and are therefore rarely obtainable under average observing conditions. The photographic limiting magnitude is always greater than the visual (typically by two magnitudes).

13.5
Focal Length:
This is the length of the effective optical path of a telescopeor eyepiece (the distance from the main mirror or lens where the lightis gathered to the point where the prime focus image is formed). Focallength is typically expressed in millimeters.

The longer the focallength, the higher the magnification and the narrower the field of viewwith any given eyepiece. The shorter the focal length, the lower themagnification and the wider the field of view with the same eyepiece.

1200mm
Focal Ratio:
This is the ‘speed’ of a telescope’s optics, found by dividing the focal length by the aperture. The smaller the f/number, the lower the magnification, the wider the field, and the brighter the image with any given eyepiece or camera.

Fast f/4 to f/5 focal ratios are generally best for lower power wide field observing and deep space photography. Slow f/11 to f/15 focal ratios are usually better suited to higher power lunar, planetary, and binary star observing and high power photography. Medium f/6 to f/10 focal ratios work well with either.

An f/5 system can photograph a nebula or other faint extended deep space object in one-fourth the time of an f/10 system, but the image will be only one-half as large. Point sources, such as stars, are recorded based on the aperture, however, rather than the focal ratio – so that the larger the aperture, the fainter the star you can see or photograph, no matter what the focal ratio.

f/8
Resolution:
This is the ability of a telescope to separate closely-spaced binary stars into two distinct objects, measured in seconds of arc. One arc second equals 1/3600th of a degree and is about the width of a 25-cent coin at a distance of three miles! In essence, resolution is a measure of how much detail a telescope can reveal. The resolution values on our website are derived using the Dawes’ limit formula.

Dawes’ limit only applies to point sources of light (stars). Smaller separations can be resolved in extended objects, such as the planets. For example, Cassini’s Division in the rings of Saturn (0.5 arc seconds across), was discovered using a 2.5” telescope – which has a Dawes’ limit of 1.8 arc seconds!

The ability of a telescope to resolve to Dawes’ limit is usually much more affected by seeing conditions, by the difference in brightness between the binary star components, and by the observer’s visual acuity, than it is by the optical quality of the telescope.

0.76 arc seconds
Aperture:
This is the diameter of the light-gathering main mirror or objective lens of a telescope. In general, the larger the aperture, the better the resolution and the fainter the objects you can see.
6"
Weight:
The weight of this product.
76 lbs
Heaviest Single Component:
The weight of the heaviest component in this package.
19 lbs
 
Based on Astronomy magazine’s telescope "report cards", scopes of this size and type generally perform as follows . . .
Terrestrial Observation:
Observing terrestrial objects (nature studies, birding, etc.) is usually possible only with refractor and catadioptric telescopes, and convenient only when the scope is on an altazimuth mount or photo tripod. Most reflectors cannot be used for terrestrial observing. Scopes with apertures under 5" to 6" are generally most useful for terrestrial observing due to atmospheric conditions (heat waves and mirage, dust, haze, etc.) that degrade the image quality in larger scopes. 
No
Lunar Observation:
Visual observation of the Moon is possible with any telescope. Larger aperture scopes will provide more detail than smaller scopes, thereby getting a higher score in this category, but may require an eyepiece filter to cut down the greater glare from the Moon's sunlit surface so small details can be seen more easily. Lunar observing is more rewarding when the Moon is waxing or waning as the changing sun angle casts constantly varying shadows to reveal craters and surface features by the hundreds.  
Great
Planetary Observation:
Great
Binary and Star Cluster Observation:
Great
Galaxy and Nebula Observation:
Good
Photography:
Yes
Terrestrial Photography:
Photographing terrestrial objects (wildlife, scenery, etc.) is usually possible only with refractor and catadioptric telescopes, and convenient only when the scope is on an altazimuth mount or photo tripod. Most reflectors cannot be used for terrestrial photography. Scopes with focal ratios of f/10 and faster and apertures under 5" to 6" are generally the most useful for terrestrial photography due to atmospheric conditions (heat waves and mirage, dust, haze, etc.) that degrade the image quality in larger scopes.
No
Lunar Photography:
Photography of the Moon is possible with virtually any telescope, using a 35mm camera, DSLR, or CCD-based webcam (planetary imager). While an equatorial mount with a motor drive is not strictly essential, as the exposure times will be very short, such a mount would be helpful to improve image sharpness, particularly with webcam-type cameras that take a series of exposures over time and stack them together. Reflectors may require a Barlow lens to let the camera reach focus. 
Yes
Planetary Photography:
Yes
Star Cluster / Nebula / Galaxy Photography:
Yes
Optical Coatings:
Fully multicoated
View Finder:
9 x 50mm
Warranty:
2 years
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General Accessories
Computers for Telescopes (1)
SkySync GPS Module for all Celestron non-GPS computerized scopes
by Celestron
Quantity:  
$199.95 
Drive Motors and Drive Accessories (2)
Power Tank 17 Amp-hour 12V DC rechargeable battery
by Celestron
Quantity:  
$129.95 
5 Amp AC adapter for Celestron VX, CGEM, and CGE Pro mounts
by Celestron
Quantity:  
$69.95 
Vibration Dampeners (1)
Vibration Suppression pads, set of 3
by Celestron
Quantity:  
$49.95 
Visual Accessories
Star Diagonals (3)
1.25" 99% Reflectivity dielectric mirror diagonal
by Astro-Tech
Quantity:  
$69.95 
1.25" 99% reflectivity dielectric quartz mirror diagonal
by Astro-Tech
Quantity:  
$79.95 
2" 99% Reflectivity dielectric mirror diagonal for refractors
by Astro-Tech
Quantity:  
$119.95 
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6" Advanced VX Series Go-To Equatorial Refractor

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6" Advanced VX Series Go-To Equatorial Refractor
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Our Product #: AVX6R
Manufacturer Product #: 22020
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This 6" f/8 Celestron AVX6R achromatic doublet refractor telescope has anew imaging-optimized Advanced VX Series computerized go-to German equatorial mount that will find and followover 40,000 deep space and solar system objects for you . . .





. . . our 34th year