Second Hand Omegon 203mm Push + Dobsonian Telescope

Second Hand Omegon dobsonian telescope push + 203. The scope is in excellent condition and has had a full optical check in house by the RVO team. The previous owner of this scope has added a portable supply and a blue holder which can be seen in the images above.

The unit includes everything from new.

Please note this item is collection only as the shipping boxes are not included.

• RVO used and approved
• 3 months warranty 
• Optical test done in house by RVO

Your smartphone phone and this telescope are now 'best friends'

Experience a whole new feel to exploring the night sky with this Omegon 8 inch Dobsonian telescope together with the Push+ object locator. This telescope can find any planet or deep sky object in the twinkling of an eye! This is made possible by the intelligent Push+ object locator - the telescope communicates instantaneously with your smartphone!

The advantages in a nutshell

finding newly invented - you can now located any object in the night sky using the Push+ object locator and your smartphone
built-in digital encoder - your telescope immediately knows where it is pointing. The software allows you follow every step and locate objects in a jiffy.
Bluetooth 2.0 provides a wireless connection to your smartphone - with a range of 10 meters
software - take control of your telescope with the SkySafari® 4 Plus app for Android
GP receiver - mounts any telescope with a GP rail

The optics - high contrast and sharp images thanks to the parabolic mirror

Good optics are the heart of any telescope - the 203mm parabolic main mirror here provides a sharp image right out to the edge of the field of view, for a visual experience where you might forget that you are still on Earth and are only 'travelling' with your eyes.

A journey into the past - getting into the world of galaxies

203mm of aperture lets you enter a whole new domain - that of the 'deep sky objects', or DSOs. You can observe globular clusters thousands of lightyears away, sparkling like a million diamonds in your telescope. Or even galaxies - 'islands of stars' like our Milky Way.

You can observe the following objects with the telescope

• Globular clusters
• Planetary nebulae
• Galaxies
• Open clusters
• Hydrogen nebulae
• Planets, comets and much, much more.

Omegon Dobsonians open a new door to the universe - the main mirror in this telescope gathers 75% more light than a 150mm telescope. You can explore hundreds of objects in the night sky.

Digital Encoder - a 'satnav' for your telescope

Know where you are - the digital encoders on the azimuth and elevation axes tell you just where you are in the night sky at all times. This technology, which is used on large equatorial mounts, is now also employed with this Dobson telescope. But all this would be nothing without a good controller - and this you already have!

Smartphone - your way to the stars

Your Android smartphone now allows you to keep track of everything yourself - the Sky Safari® 4 Plus astronomy app for Android systems turns your phone into a control centre for your telescope. The coloured display on your smartphone shows the current region of the night sky and allows you to select an object you wish to observe. You can then move the telescope to the target in a jiffy - as you move the telescope in the direction required, you will see a crosshair moving across the star chart.

With the right app it's easy

You can purchase the SkySafari® Plus app at Google Play. Push+ will not work with Apple iPhones or iPads (iOS operating system)

GP receiver

The rocker box has a receiver for Vixen style GP rails. This means you can connect most telescopes with GP rails to the rocker box and benefit from the Push+ system. This works best with Newtonian reflector telescopes of up to 8 inches in diameter.

Ensure your exploration of the night sky is always successful with Push+.

Note: smartphone and App are not included.

SPECIFICATIONS

Optics
Type                                        Reflector

Type of build                          Newtonian

Aperture (mm)                        203

Focal length (mm)                 1000

Aperture ratio (f/)                   4,9 

Max. useful magnification     406

Tube construction                  Full tube

Focuser  Type of build           Crayford

Connection ( to eyepiece)  2

Mounting type                      Dobsonian
 
GoTo control                         Push To

Material                                 Wood

Included accessories:

• 1.25'' eyepieces  25mm 10mm
• Red dot finder
• Series Push +

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.

Are you interested in this product but would like to speak to someone with some more information? Simply fill in the form below and we will get back to you as soon as we can!

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