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Skywatcher Evostar 90 EQ2 Telescope

Skywatcher Evostar 90 EQ2 Telescope
Price:  £227.99(Inc. 20% VAT)
Add Accessory Bundle

Model:  10724
Brand:  Skywatcher
Design  Refractor
Size  3.5" (90mm)
Computerized  Manual
Level  Beginner
Mount Type  Equatorial



Generally In Stock, Please Confirm Before Ordering

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

  (1 Review)

The Sky-Watcher EVOSTAR-90 (EQ2) telescope is a classic two-element, air-spaced, achromatic refractor. It is an outstanding, high-performance, high-resolution instrument manufactured to high standards of optical and mechanical precision. With its long focal length and breathtaking, diffraction limited optical performance, it is ideal for the detailed high-power study of the Moon, Double-Stars, Planets and other objects in our solar system, providing crisp contrasty images. Supplied with the EQ2 equatorial mount, which when polar aligned, will allow you to easily track objects as they move across the night sky via its slow motion control cables.

Magnifications (with eyepieces supplied): x36, x72, x90, x180
Highest Practical Power (Potential): x180
Objective Lens Diameter: 90mm
Telescope Focal Length: 900mm (f/10)
Eyepieces Supplied (1.25"): 10mm & 25mm
x2 Deluxe Barlow Lens (1.25") with Camera Adaptor
6x30 Finderscope
1.25"/31.7mm Star Diagonal
Multi-Coated Objective Lens
EQ2 Equatorial Mount
Aluminium Tripod with Accessory Tray
65% more Light Gathering than 70mm

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

A great first scope
27 February 2015  | 

I guess it's hard to give this a star rating as it's my first scope and I have no previous experience to compare it to. So I will review this based on y expectations and what you get for the money.

I chose this scope after reading this excellent guide to a first scope:

As my main initial interest is in the moon and planets rather than deep space objects I decided that a refractor was the one for me and chose Rother Valley Optics after a recommendation by my cousin. As it was a present I can't comment on the customer service, however it arrived quickly (a day earlier than expected I think so worth checking when it's getting dispatched). The plastic eyepiece protector had a small crack when I opened the box where it looks like the courier may have dropped it, however a quick look down the tube with an eyepiece showed the optics were not affected so this seems like a pretty robust scope. You also get a lot for your money! Scope, finder scope, mount, slow-mo controls, tripod, two eye pieces and a Barlow lens. You really don't need to think about buying anything extra to get going when buying this scope. Maybe a solar filter if you want to look at the sun. Everything seems good quality, although I am sure there are slightly more sturdy and refined tripods and mounts out there everything that came with this was as good, if not better than what I would expect for the price.

It took me about half an hour to put it all together using the instruction manual which was ok (I'm a 32 year old adult and would recommend that an adult put this together and set up for observing as I think it would be too difficult for a child). I found it much easier to use a video off the internet to set up the scope outside for my first viewing and having got pretty close to a polar alignment I was able to start observing a few things before the weather set in. I found Jupiter almost straight away and couldn't help but smile upon clearly seeing the round disc of the planet in the eyepiece with it's distinct cloud belts and it's 4 visible moons in orbit (which are tiny white dots in the eyepiece). It is small in the eyepiece but clearly visible. Then I moved on to the moon. This was incredible, like looking at a 4k television showing a National Geographic documentary, but better! Using the 10mm with the x2 Barlow is still fantastically clear, being able to see the rough, imperfect edges of the dusty crater rims. I found this combination of eye pieces a bit too much for looking at Jupiter as it did start to loose detail, my favourite for this being the 25mm with the Barlow. Overall I was really pleased by what I saw during my first hour of observing. So if you want a good first scope I would say get this one, I may upgrade in time or buy a large Newtonian if I acquire a taste for searching distant stars, but for now I am very happy with what I have. So read the guide in the link and buy this scope if you're interested. Just make sure you have somewhere suitable to store it, it is rather heavy and cumbersome to move around once the tripod legs are set up. Buy this scope and enjoy!

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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

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.

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


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