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ZWO SeeStar S50 All in One Smart APO Telescope

ZWO SeeStar S50 All in One Smart APO Telescope
ZWO SeeStar S50 All in One Smart APO TelescopeZWO SeeStar S50 All in One Smart APO TelescopeZWO SeeStar S50 All in One Smart APO Telescope
Price:  £539.00(Inc. 20% VAT)
RVO 3D Printed Dust Cover
RVO 3D Printed Bahtinov Mask
RVO 3D Printed Light Shield
RVO 3D Printed Diffraction Spiker 6
RVO 3D Printed Diffraction Spiker 4
RVO 3D Printed 2 Inch Filter Holder

Model:  ZWO-Seestar-S50
Brand:  ZWO



Generally In Stock, Please Confirm Before Ordering

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

  (3 Reviews)

A good selection of accessories are available for the ZWO SeeStar, all 3D printed in house by the RVO team. You can select your accessories from the checkboxes above.

Average Rating (3 Reviews):  
Write a Review and share your opinions!

S50 .. Wow !
16 April 2024  | 

The Seestar s50 is a game changer,

It'll not replace my beloved redcat, but its a box you switch on and get exploring with as fast as you can switch on the wifi !

None of this tech existed when I first got into astronomy, but wow I'm so glad its here now,

Easy to use and way better than a scope that never gets taken out,

Thanks ZWO you've done really really good with the seestar

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This review has not been appraised.

ZWO Seestar S50
03 November 2023  | 

I received my S50 Yesterday, and yes clouds and storms, But today we have had gaps in the clouds, So I set up, within five minuets I have images of both the Sun and Moon, The Solar filter with the kit works like a dream, I think I even captured Mercury in the image. So five minuets three objects, Sun, Moon and a planet, the best and easiest first light experience I have ever had. I cannot wait for the first semi clear night, and of course the first totally clear and frosty night, I have paid lot's more than the cost of this kit just on cameras, and needed tripods, telescopes and lots of other things and got nothing for my efforts, this SeeStar S50 will do the deed straight out of the box,, I'm Well happy.

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3 of 5 people found this review helpful.

The start of a revolution!
23 October 2023  | 

Managed a couple of sessions with the Seestar. Really impressed with the results for a 50mm lens. This without doubt the trajectory that Telescopes will go. I do have a c8 edge setup for astrophotography, but this little baby helps me to see what is there and use my bigger scope to improve. So easy to set up out of the box and does not need the user to know anything about deep sky objects. This would not disappoint any newcomer or experienced astronomer. For a first telescope, definitely go for it. I look forward to the technology advancing to much larger scopes.

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10 of 12 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

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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