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Skywatcher Skymax 150 Pro Optical Tube Assembly

Skywatcher Skymax 150 Pro Optical Tube Assembly
Price:  £619.00(Inc. 20% VAT)

Model:  10885
Brand:  Skywatcher
Design  Maksutov
Size  6" (150mm)



Generally In Stock, Please Confirm Before Ordering

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

  (2 Reviews)


Magnifications with Eyepieces Supplied: x64
Highest Practical Power (Potential): x450
Diameter of Primary Mirror: 150mm
Telescope Focal Length: 1800mm (f/12)
Eyepieces Supplied (2"): 28mm
9x50 Finderscope & Bracket
2” /50.8mm Star Diagonal
Focusing by Moving Primary Mirror
Dovetail Mounting Bar

"Jupiter was a mesmerising sight" ..... "High contrast optics indeed"
BBC Sky At Night Magazine

“Great package for the price…The telescope optics are fully multicoated and the secondary mirror obstructs just 26 per cent of the primary diameter, making it good for planetary imaging. Testing the optics showed excellent correction and contrast; results that were backed up by our observations of a variety of celestial objects. Views of Saturn during a night of superb seeing were excellent – we could clearly see the Cassini Division in the rings and the planet’s equatorial band. Contrast on the Moon was very high and it split the stars of the ‘Double-Double’ very cleanly.”

Average Rating (2 Reviews):  
Write a Review and share your opinions!

Sky Watcher Skymax 150
09 October 2022  | 

Excellent service and next day delivery. The telescope did not disappoint, it is well built and good value for the price. Due to my light polluted location l was mainly looking to do planetary imaging which is why l went for this telescope. After two sessions l have imaged both Saturn and Jupiter and am very impressed so far with the images. Hopefully over the next few weeks l will have better seeing conditions and even better images. After having used a Celestron 11" telescope l was surprised how much detail you can obtain with this 6" telescope.

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This review has not been appraised.

Skymax150 - an odd review
16 February 2017  | 

Sky-Watcher, Skymax150
The tale of finding new optics.

I've had an idea, a costly idea,
To upgrade my optics, with some criteria.

I have two newts, a big and a small,
The big too cumbersome, the small, just too small.

I longed for something better, compact and nice,
Yet still powerful, for some higher demands.

So I set sail to the optics's seas,
To find a scope, that will suit my needs.

I have searched far and wide,
Took advice from left and right.

That being said, I was not without an idea;
Initially favouring the Skymax familia.

But a research is not done proper,
Until I examine any other offer.

So I searched, and searched, and learned,
In every nook and cranny, some hope emerged.

But nothing suited the way I liked,
As my options were limited, by budget and size.

Exhausted I was, hungry and cold,
I yearned to be, on stable shores.

So I took what I've learned, and made up my mind,
Turned my sails to homeward bound.

After an odyssey, it came to be,
I found myself anchoring, at the Skymax pier.

180 to heavy, 127 too light,
I went in the middle, at 150 I stopped.

My journey at the end, a new toy in the bag,
I could not wait, for first light's night.

First light came, the very next night,
So did the clouds, to spoil my time.

But I made up my mind, and set up my rig,
Waiting for the gaps, on top of Pex Hill.

The gaps came and ceased, few and far in between,
But I persevered, and tested my rig.

The field was a bit narrow,
But that's okay from a mako.

Collimation perfect, a textbook case,
No need to touch it, I wouldn't dare.

M 42 easy, and what a sight,
Almost like my big newt, it blew my mind.

Andromeda was also, a sight to behold,
But was faded by a near full Moon.

The Moon was blinding, but oh so amazing.
I just can't wait, for further star gazing.

First light was ended, by a thick layer of cloud,
But I still had, a blissful short time.

Since then I purchased, a focal reducer 0.5,
From Antares, to make my filed wide.

Second light came, worse that first,
Yet perseverance once again, gave me quick bursts.

Now I was gazing with an f6,
At Orion's sword at 69x

Fitting in snugly in the view of my eye,
Even Trapezium was visible quite nice.

This might not be the most professional review yet,
But pardon me, I am an amateur at best.

To sum up my writing, let me quote a classic;
“I think this is the beginning of a beautiful friendship.”

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29 of 35 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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