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Skywatcher Skyliner 200P Dobsonian Telescope

Skywatcher Skyliner 200P Dobsonian Telescope
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Price:  £369.00(Inc. 20% VAT)
+
Add Accessory Bundle (Moon Filter, Planisphere & Smartphone Holder)

Model:  10717
Brand:  Skywatcher
Design  Reflector
Size  8" (200mm)
Computerized  Manual
Level  Intermediate
Mount Type  Dobsonian

Availability  

  

Generally In Stock, Please Confirm Before Ordering



2 Year Warranty On All New Items
(Excluding Batteries & Globes)


  (1 Review)

Dobsonian telescopes offer an incredible aperture-to-price ratio. The Dobsonian mount, popularized by John Dobson in the 1970.s, is a simple and efficient method of mounting a Newtonian reflector, based on the Alt-Azimuth principal. Fast and easy to set up, the Dobsonian mount consists of a box-type mounting which allows the telescope to pivot in altitude, while the box itself is rotated on a base in azimuth. The secret of the design is to correctly balance the optical tube and use frictional materials which allow it to be moved easily when nudged but to stay in position when not. The mount is designed to be driven by hand as opposed to slow motion controls. Sky-Watcher Dobsonians provide excellent all round performance for the observation the Moon and Planets and Deep Sky Objects such as Galaxies and Nebulae.

  • Magnifications (with eyepieces supplied): x48 & x120
  • Highest Practical Power (Potential): x406
  • Diameter of Primary Mirror: 203mm
  • Telescope Focal Length: 1200mm (f/5.91)
  • Eyepieces Supplied (1.25"): 10mm & 25mm
  • Dual-Fit 1.25"/2" Focuser
  • Parabolic Primary Mirror
  • 0.5mm Ultra-Thin Secondary Mirror Supports
  • 9x50 Finderscope
  • Direct SLR Camera Connection
  • Wooden Alt-Azimuth Mount with Accessory Tray
  • 77% more Light Gathering than 150mm

Highly commended

"“The Skyliner 200’s flat-packed base is very easy to build and set up, and comes with excellent instructions….The optics were sharp across 80% of the 1 degree field of view….We were very pleased with the appearance of al the test objects – we even managed to find the Crab Nebula, M81 and M82 in near-full Moonlight, whereas the other scopes were struggling. Under darker skies the Double Cluster had that ‘Wow’ factor when it was centred using the 25mm eyepiece, as did M35. The Pleiades (M45) was just a bit too large to fit in the field of view, but the main central stars looked stunning….Turning to Saturn, the view really took our breath away: we saw five moons, a clear-cut Cassini Division and a colour difference between the A and B rings. Not only that, but Saturn also displayed a prominent belt – with this scope planetary detail is certainly not compromised….Fans of deep-sky observing would certainly find the Skyliner satisfying….The Skyliner was a joy to use.”"
BBC SKY AT NIGHT MAGAZINE

Average Rating (1 Review):  
Write a Review and share your opinions!

Rating:  
Well impressed
20 January 2015  | 

After having to give up star gazing for a length of time, and my last scope being a Nexstar 6SE, I was looking for a replacement which would be light enough, cheap enough to get back into the hobby and comfortable to use. A bonus would have been a scope that would give me as close a good view of the sky as the 6SE did. WOW. Setup was a doddle. The base fitted together easily and securely and the tube was light enough to be handled by one person. Was I lucky, the first night of ownership was to be a clear sky. Could see with the naked eye that the viewing should be quite good for a modestly priced telescope. Set it up, attached 25mm eye piece, looked in and got the biggest surprise of my life. I have never seen so much through a scope, not even the Nexstar 6SE. There were stars everywhere, I just cannot say how glad I was to purchase the scope, especially as I was only in the shop looking for model paints. Cannot wait until I have got my bearings in the sky again as then I will get to see just how good it is. My many thanks to everyone at Rother Valley Optics for their patience and guidance to get me set up again.

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101 of 102 people found this review helpful.

Some items that are showing as in stock are in stock at our holding warehouses, not at the shop. To double check the stock levels at the shop, please contact us on 01909774369 or sales@rothervalleyoptics.co.uk.

The delivery times for most items is 1 - 2 days but again, please double check stock levels on important orders before placing an order via the website.

The delivery costs for courier next day are for mainland UK only. If you live in the Scottish Highlands/Islands, Channel Islands or Northern Ireland, then a shipping surchage will apply. please contact us for prices. Smaller items can still go 1st class via Royal Mail.

Please note that if you are wanting to take advantage of our Saturday and Sunday timed services or next day pre 12 or pre 10:30 services, you MUST check that the stock is here at the shop before placing orders. Also, orders using the Saturday and Sunday services must be placed before 1pm the previous working day. Also, please remember to check that the stock is here at the shop before placing orders. If the stock is not at the shop, we won't be able to ship on any of the timed services. 

Please note International customers will need to contact us for a shipping price prior to ordering via the website. We don't ship all items internationally. It is at our discretion what we ship outside of the UK. This all depends on the size and weight of the items. Please get in touch with us for any postage costs. Please note we do NOT ship telescopes or heavy items outside of the UK. This is due to massive postage costs and problems regarding returns.

If you have any questions regarding stock levels or delivery, please get in touch.

Zygo Interferometer Testing For ED Refractor Telescopes!

We are extremely pleased to announce our Zygo Interferometer is now installed and ready for use! Our experienced staff can test refractor lenses up to 120mm aperture and provide a comprehensive 2 page report showing the optical quality and Strehl ratio, plus much more information. We are using the very latest Zygo MX software to provide a more detailed report compared to other standard reports.

 

The interferometer is essentially a measuring instrument. Within the interferometer is a calibrated laser that is pointed through the optical test surface, then onto a high quality reference sphere, then back through the test subject then to an internal camera which gives us the measurement on the screen. From this, we can adjust the position of the test optic and the reference sphere to obtain a perfectly calibrated system. The more central the laser to the test optic and then on return, the better and more accurate reading and measurement we can take. This takes a lot of adjustment to get the best results from the optical surface. Once the measurement has been taken, we are provided with a series of results that show the optical quality of the surface plus other information. Continue reading for an explanation of the individual values and you can also see a test report that was done on one of our RVO Horizon 60 OTAs. 

We are offering certain telescopes with a Zygo test at an extra cost. Mainly ED doublets and triplets. All available telescopes with a Zygo test report are listed here. Just select Zygo Test Report from the drop down box at the top of the listing and we will test the optics in house and provide a full 2 page report with your scope. This will show you the optical quality of your telescope optics. We can also offer this service on your refractor telescope. Please get in touch for more details about this. 

At Rother Valley Optics, one thing we pride ourselves on is customer service and quality of our equipment. When we test your telescope, we will ensure that it is of the highest quality otherwise, we will reject the scope under our strict quality control and test another model for your peace of mind. One of the main values to look at when testing a refractor is the Strehl ratio. The higher this number, the higher quality lens you have. At Rother Valley Optics, we will guarantee the highest possible Strehl ratio for your telescope.  We will aim to provide 0.95 Strehl or higher on Takahashi, RVO Horizon, William Optics and many more! Generally, the higher the Strehl ratio, the lower the Astigmatism and Coma meaning a better image quality from your instrument. 

Other measurements such as the PV and RMS are important too. With these measurements, the lower the number the better as it shows less curvature on the lens. The flatter an optical lens, the better it will perform. The PV rating (Peak To Valley) is a measurement from the highest point (Peak) to the lowest point (Valley). From this we get the RMS (Root, Mean, Square). This is a similar figure to the PV and measured exactly the same way. The RMS is basically an average height difference from the PV so again, the lower the better. As you can see form the example below, we measured an RMS of just 0.027 wave which is a very good value.

We also measure the Power with our systems which is essentially the error from the reference sphere to the test optic. The reference sphere we use on our system is a very high quality sphere so the closer to zero the Power, the less error between the 2 elements thus ensuring a higher quality optical surface. 

You will also see some more values such as Astigmatism and Coma. Again, these are measured by the interferometer when we take measurements of the optical surface after adjustment. These are values which ideally would be at 0 but as our test optics are all curved lenses, there will always be astigmatism and coma present. The lower the number, the less of these aberations you will effectively see but with most refractors, you can buy field flatteners which will compensate for the coma anyway. The astigmatisms value is explaining the error between the symmetrical curvature of the lens. Basically, no lens will be perfectly symmetrical, the lower the astigmatism, the more symmetrical the lens surface is. 

Once the Zygo test report has been completed, the optical alignment is thoroughly tested and tuned to ensure they are spot on before they leave us. 

All available telescopes are on the website at the link below and ones we've tested already that are available straight away are also listed.

https://www.rothervalleyoptics.co.uk/zygo-tested-refractors.html

Here is an example of the test what we provide. This was a test on one of our Horizon 60 ED OTA's.

For any questions about this amazing new service, please either call 01909774369 or email sales@rothervalleyoptics.co.uk.

 


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