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Why we love the Sky-Watcher Classic 250P 10" Dobsonian Telescope (S11620)
Product Description
Developed in the 1970s, the Dobsonian-style telescope is an inexpensive solution for bright, detailed visual observing using a simple design. The name Dobsonian comes from the telescopes inventor, John Dobson, a Vedanta monk who popularized sidewalk astronomy and dedicated his life to astronomy outreach. Dobson was notorious for constructing large aperture reflecting telescopes capable of deep sky viewing, using low cost materials. These were often made with found materials, heavy cardboard tubes, recycled porthole glass, and plywood mounts. Dobson, who literally wrote the book on how and why to make amateur telescopes, encouraged other astronomers to assemble their own telescopes and taught workshops on telescope making.
The Classic Dobsonian uses a parabolic primary mirror design, constructed of borosilicate, then polished and coated with our proprietary Radiant Aluminum Quartz (RAQ), producing a remarkable 94% reflectivity. With a 10-inch aperture, the Classic 250P Dobsonian is 1235 times brighter than the human eye! This simple yet effective design is perfect for visual observation of faint objects, such as nebulae, star clusters, and galaxies.
Supporting the Classic Dobsonian is more than just a simple rocker box. The base uses Teflon bearings for smooth, easy azimuth slewing and a patented tension control handle to lock the telescope in place. Once locked on an object, the telescope can support both 1.25-inch accessories as well as the heavier 2-inch eyepieces, allowing you to use virtually any eyepiece on the market. The Classic Dobsonian includes two 1.25-inch eyepieces, a 1.25-inch adapter, a 2-inch eyepiece adapter, dust caps and a 9x50 finderscope.
At Sky-Watcher, we stay true to the traditional John Dobson design, using just two mirrors, a metal tube, and a simple rocker box. Although we love computerized telescopes, using a star chart to find objects by hand can be far more fulfilling and will improve your knowledge of the night sky. Unplug your electronic devices, step outside, and become immersed in the wonders of the universe.
What's in the Box
Specifications
| Optical Info | |
| Optical Design | Newtonian |
| Mirror Coatings | Radiant Aluminum Quartz (RAQ) coatings with 94% reflectivity |
| Glass Type | Borosilicate |
| Primary Aperture (mm) | 254 |
| F/Ratio | 4.7 |
| Focal Length (mm) | 1200 |
| Secondary Diameter | 64mm |
| Secondary Obstruction (by diameter) | 25% |
| Secondary Obstruction by Area | 6% |
| Observational Info | |
| Dawes Limit | 0.46 |
| Rayleigh Limit | 0.55 |
| Limiting Mag. | 1450% |
| Minimum Magnification | 3600% |
| Maximum Magnification | 500 |
| Light Gathering (compared to next size down) | 57% |
| General Info | |
| Focuser | 2" Crayford |
| OTA Length (Retract/Ext.) | 45" |
| OTA Outer Diameter | 11.375" |
| OTA Weight (with accessories) | 28 |
| Dob Base Weight | 25 |
| Dob Base Measurements | 29"x20.5" |
| Zenith Eyepiece Height | 48" |
| Accessories | |
| Included Finder | 9x50 Finder |
| Included Diagonal | No |
| Included Eyepieces | 25/10 Super (modified Kellner) |
| Magnification w/ Included Eyepieces | 48x/120x |
| Included Case | No |
| Corrector | No |
What can I see with a Sky-Watcher Classic 250P 10" Dobsonian Telescope (S11620)?
Here are some simulated views of common objects. Results with your telescope will vary with viewing conditions, obrits, equipment and more.
Jupiter with
25mm Eyepiece - 48x Magnification
(Included with This Telescope)
Jupiter with
10mm Eyepiece - 120x Magnification
(Included with This Telescope)
Jupiter with
5mm Eyepiece - 240x Magnification
Sold Separately
Moon with 25mm Eyepiece
48x Magnification
(Included with This Telescope)
Moon with 10mm Eyepiece
120x Magnification
(Included with This Telescope)
Moon with 5mm Eyepiece
240x Magnification
Sold Separately
Andromeda with 36mm Eyepiece
33x Magnification
Sold Separately
Andromeda with 25mm Eyepiece
48x Magnification
(Included with This Telescope)
Andromeda with 10mm Eyepiece
120x Magnification
(Included with This Telescope)
Customer Reviews
Very high quality instrument, razor sharp optics and everything is very bright. A little bit of a flaring effect when looking through an eyepiece at an oblique angle, but nothing that gets in the way of the observing experience. Also very good for planetary, lunar, and solar imaging - if you can keep it steady long enough.
Love it 😊
This has been my first and only telescope. It's a wonderful piece. I've used it for planetary and moon viewing so far. It's big enough to see Jupiter in great detail but small enough I can load it into my car without too much trouble.
This is the first telescope I've owned and it's been very fun and user friendly. As a beginner I've mainly only looked at planets and the moon so far but I plan on looking at other objects soon and have no doubts that it'll be great! I would definitely recommend this scope for beginners like me.
Additional Articles, Videos, and Links
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