6" f/8 traditional Dobsonian reflector

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This 6” Sky-Watcher Dobsonian reflector has:
  • 6" aperture 1200mm focal length f/8 Newtonian optics
  • single-speed 2” rack-and-pinion focuser with 1.25” adapter 
  • 6 x 30mm finderscope 
  • 1.25” 10mm and 25mm Plössl eyepieces 
  • Teflon altitude and azimuth bearings
  • altitude tension clutch
  • eyepiece tray 
  • free shipping
    Like all Dobsonian reflectors, this very affordable 6” Sky-Watcher traditional solid tube Dob gives you more light-gathering for your visual observing dollar than any other telescope type. It shows you faint deep space objects that are simply invisible in smaller scopes. Its visual limiting magnitude of 13.4 makes this 6” Sky-Watcher a natural for observing faint nebulas, galaxies, and star clusters, particularly from a dark sky site. 

    With an f/8 focal ratio parabolic mirror and very thin 0.5mm secondary mirror spider vanes to reduce diffraction, the Moon and planets are sharp and well-defined. They show high contrast and none of the violet halo of spurious color you find in similarly-priced smaller aperture achromatic refractors.

    The 6” Sky-Watcher Dobsonian is easy to get to your favorite observing site, too, whether that be your own back yard or a dark sky site miles out of town. The Sky-Watcher breaks down into two components – a 46” long 12.7 pound optical tube and a 25 pound wooden rocker box altazimuth base. It weighs only 38 pounds fully assembled. And assembling the 6" Sky-Watcher Dob takes just a moment, with no tools needed. Simply lift the optical tube, rest its circular altitude bearings in the semi-circular cutouts in the sides of the rocker box, put in an eyepiece, and you’re ready to observe.

    The optical tube rides on Teflon altitude and azimuth bearings. It moves smoothly in altitude and azimuth to manually find and track objects at the touch of a finger. The 6" Sky-Watcher Dob is equipped with an altitude tension control handle. This lets you adjust the tension in altitude with a simple twist of the wrist. This lets you compensate for differing eyepiece weights to keep the optical tube from sinking when changing from a lighter to a heavier eyepiece.

    Other features include an eyepiece tray, two 1.25" Plössl eyepieces (48x and 120x), a 6 x 30mm straight-through finderscope, and a 2" rack-and-pinion focuser with a 1.25" eyepiece adapter. Your 6" Sky-Watcher Dob comes with everything you need to start observing immediately.    

    Simply made, but with precision optics, this remarkably affordable Sky-Watcher 6” traditional solid tube Dobsonian reflector will reward you with bright deep space and solar system views and years of trouble-free observing enjoyment.

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).

13.4
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.

0.77 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.
38 lbs.
Heaviest Single Component:
The weight of the heaviest component in this package.
25 lbs.
Telescope Type:
The optical design of a telescope.  Telescope type is classified by three primary optical designs (refractor, reflector, or catadioptric), by sub-designs of these types, or by the task they perform.
Reflector
 
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:
Very Good
Binary and Star Cluster Observation:
Very Good
Galaxy and Nebula Observation:
Fair
Photography:
No
View Finder:
6 x 30mm
Warranty:
2 years
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6" f/8 traditional Dobsonian reflector

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6" f/8 traditional Dobsonian reflector
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Our Product #: S11600
Manufacturer Product #: S11600
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This very affordable Sky-Watcher traditional 6” solid tube Dobsonian reflector offers big performance at a little price. It’s easy to transport, easy to assemble, easy to own, and easy to use.





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