Bresser MC-90/1250 EQ3 Maksutov Telescope

Whether you are a beginner or advanced and on a trip, this compact telescope with high image contrast incl. equatorial EQ-3 mount shows you the wonders of space.

Complete set of beginner's telescope, tripod, mount & accessories
Compact dimensions, also suitable for balconies
Telescope aperture: 90 mm / focal length: 1250 mm
Very good for Sun, Moon & planets even from the city!
Many accessories for immediate start included
Astrophotos with smartphone possible
Fine adjustment with flexible shafts in 2 axes
With secure aperture sun filter

Taking off to the stars from your own balcony – with this complete astronomy set that is easily done. The compact Maksutov-Cassegrain telescope with 90 mm aperture and 1250 mm focal length fits everywhere. And thanks to the high contrast, you will be amazed by fascinating insights into outer space even while standing in the brightly lit city. Especially the Sun, Moon and planets look great through the high-quality optics of the beginner's telescope. The set includes everything you need for successful sky observation: an astronomical Maksutov-Cassegrain telescope with 90 mm aperture and 1250 mm focal length, an equatorial EQ-3 mount, a tripod and extensive accessories. The system impresses with its simple operation, which makes life easier for astronomy beginners in particular. Thanks to its compact dimensions, the powerful telescope is also ideal as a travel telescope for more experienced stargazers.

A great combination – the telescope
The decisive advantage of the Maksutov-Cassegrain construction: the powerful optics have a long focal length, but can still be easily transported due to their very compact design. The recipe for success is the combined optics of mirrors and lenses with very good imaging properties.
The 90 mm aperture admits a lot of light into the beginner's telescope and thus ensures a good resolution. In addition, 90 mm aperture and 1250 mm focal length result in an extremely large focal ratio (ratio of aperture to focal length) of 1 to 13.9 (F/13.9). The impressive result: a very sharp image with excellent contrast. Moon, Sun and planets – especially the celestial bodies in our immediate vicinity are more than worth a look through the BRESSER Messier MC-90/1250 Maksutov-Cassegrain telescope for beginners. But various deep-sky objects are also a sight to behold: go on a discovery tour through space and marvel at open star clusters, globular clusters and so-called planetary nebulae such as the fascinating Dumbbell Nebula M27. Thanks to the resolution of the 90 mm aperture, you can enjoy really sharp images at magnifications of up to about 180x. The technology allows more, but you have to reckon with blurriness at higher magnifications. In addition to your telescope, the air turbulence in the atmosphere (seeing conditions) also determines how much you can actually magnify.

Your astronomy start is on a firm footing – mount and tripod
The beginner's telescope comes with a height-adjustable aluminium tripod and an equatorial EQ-3 mount – the perfect basis for your exploration of the universe. The special feature of the equatorial mount: you only need to compensate for the movement of the celestial bodies on one axis instead of two. You simply align this axis parallel to the Earth's axis by pointing it approximately at the polar star – a procedure also known as "alignment". For sensitive and comfortable adjustment and tracking, the mount is also equipped with two flexible shafts with fine adjustment. Always ready to hand for every celestial highlight – to this end, your accessories will find their place on the storage plate between the tripod legs.

Keep track of things automatically: For this telescope’s equatorial EQ-3 mount, the tracking motor with item number 4951400 is available as an optional accessory. This eliminates the need to manually track a celestial object set in the telescope. When this motor is installed at the mount, it automatically tracks the celestial object, keeping it in the field of view of the eyepiece. This makes observing the night sky even more comfortable!

Everything for stunning stargazing – the accessories
With the complete astronomy set, your observations will be under a lucky star. The LED viewfinder, which is easily mounted parallel to the telescope, allows you to keep an overview of the night sky. For this purpose, a red dot is projected onto a small ground-glass screen inside the viewfinder. This dot appears to be floating in front of the sky when you look through the viewfinder. And it does so exactly where the aperture of the telescope is pointing. Thus, precise alignment and finding celestial objects becomes super simple!

The 26 mm Plössl eyepiece shows greatness in every respect: With it, you can enjoy 48x magnification with very good imaging properties on this telescope. Would you like to look even closer? Then extend your set with additional eyepieces. Because the socket diameter of 31.7 mm (1.25 inch) corresponds to an international and manufacturer-independent standard, you have a wide choice.

A comfortable view into the beginner's telescope at all times – this is ensured by the built-in 90-degree star diagonal mirror. So you can look in from the side with ease, even if your telescope is pointing vertically upwards into the sky.

It's not just the night sky that fascinates astronomers with beautiful views. Set out with the solar filter to explore our nearest star. Sunspots and granulation on the Sun are guaranteed to amaze you.
ATTENTION: Never point the telescope at the Sun without the solar filter!

What could be better than reliving unforgettable moments? With the smartphone adapter, the beginner's telescope becomes a giant lens for your mobile phone in no time. So you can easily capture and share your favourite moments with the Moon, Sun etc.

FEATURES
Entry-level Maksutov-Cassegrain telescope with 90 mm aperture and 1250 mm focal length
Very good for observing the Sun, Moon and planets
Very compact dimensions, thus well suited for the balcony or as a travel telescope
Height-adjustable tripod with equatorial EQ3 mount
Precise adjustment through flexible shafts and fine adjustment in both axes
Easy to use, good for beginners
Focal ratio F/13.9, thus very sharp image and excellent contrast
26 mm eyepiece of the "Plössl" type with 31.7 mm (1.25 inch) socket for 48x magnification
Safe solar observation with the included solar filter
Entry into astrophotography with smartphone camera adapter

SCOPE OF DELIVERY
Telescope
Aluminium tripod
Equatorial EQ3 mount
Eyepiece: 26 mm Plössl (1.25 inch socket)
Built-in star diagonal mirror
LED illuminated dot finder
Solar filter
Smartphone camera adapter
Accessory tray
Astronomy software download
Instruction manual

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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