Bresser Taurus 90/900 MPM Refractor Telescope

Off to the stars - the entry-level telescope with lots of accessories, versatile MPM mount with fine adjustment in both axes, solar filter & smartphone adapter

Complete set of telescope, tripod, mount and accessories
Easy-to-use refracting telescope for beginners
Versatile MPM mount, azimuthal & equatorial
Fine adjustment with flexible shafts in 2 axes
Telescope aperture: 90 mm / focal length: 900 mm
For Sun, Moon, planets and many deep sky objects
Astrophotos possible with smartphone
Plenty of accessories to get started straight away
With secure lens solar filter

Set up, look through, be amazed: with the BRESSER Taurus 90/900 MPM lens telescope, beginners can let their admiring gaze wander quickly and easily across the night sky. The complete astronomy set comes with everything you need for fascinating observations of the stars, planets, Sun and Moon: an astronomical lens telescope with 90 mm aperture and 900 mm focal length, an azimuthal and equatorial MPM mount, a tripod and a wide range of accessories for your new astro-hobby. The highlight of the mount: with the fine adjustment in both axes, the careful alignment and tracking of the telescope is super easy.

A classic for astro-newbies - the telescope
Very easy to handle, even for beginners and children: this classic refracting telescope - a so-called Fraunhofer achromatic refractor - will help you get started in astronomy successfully. Thanks to the modern, precisely coated optics, you will benefit from good imaging properties when looking at astronomical sights. With its 90 mm aperture, this beginner’s telescope already collects around 165 times more light than the human eye and thus offers good resolving power. In addition, the 90 mm aperture and 900 mm focal length result in a large focal ratio (aperture/focal length) of 1 to 10 (F/10). The effect: you will enjoy a sharp image with good contrast.

Due to the combination of large aperture and long focal length the telescope for beginners is a flexible multi-talent. It’s not only very suitable for observing the Moon, Sun and planets. You can also use it to get a closer look at many deep-sky objects. Enjoy the view of sparkling open star clusters and globular clusters, but also gas nebulae such as the Orion Nebula M42 or the Dumbbell Nebula M27 can be seen beautifully.

But what about the magnification? The resolving power achieved by the 90 mm aperture easily allows magnifications of up to about 180x with really sharp images. Technically, the beginner’s telescope can do a lot more: with the included accessories, magnifications of up to 675x are possible. However, you want to see the celestial bodies as clearly as possible, but as the magnification increases, the image sharpness can slowly decrease. How much you can magnify during your astronomical explorations also depends on more than just your telescope. The air turbulence in the atmosphere (seeing conditions) is also always an important factor.

Twice as good for flexible sky observation - mount and tripod
The height-adjustable aluminium tripod with a particularly adaptable mount provides a secure footing for your explorations of the universe. The MPM (Multi-Purpose-Mount) can be used both azimuthally and equatorially. In the azimuthal mode, its handling is particularly intuitive: just as with a common photo tripod, you can simply swing the beginner’s telescope to the left and right, up and down by hand. Alternatively, you can use the two flexible shafts with fine adjustment to point and track your telescope with extra precision and comfort.
The integrated polar-wedge also allows you to tilt the axis cross into an equatorial position. This means that one axis is parallel to the Earth's axis. You then only have to compensate for the movement of the celestial bodies on this one axis. No more simultaneous movement along the two axes! Of course, the two flexible shafts with fine adjustment are also usable for the equatorial mode. A handy feature of the tripod: a storage plate is placed between the tripod legs. Here your astronomy accessories are always within reach.

Fully equipped for your amazing astronomy adventure - the accessories
In addition to the telescope, tripod and mount, you need a few extras in order to make your very own exciting discoveries in the sky. Therefore, the telescope set for beginners contains all the necessary equipment and more. An important helper: the LED viewfinder. Using it is very easy: install the direction finder, which projects a red dot onto a small ground-glass screen, parallel to the actual beginner's telescope. When you look through it, the red dot appears to float in front of the sky. This allows you to quickly see what your telescope is pointing at. Thus, the LED viewfinder enables you to easily find celestial objects and align the telescope precisely - before going on to the detailed view through the magnification of the telescope.

You decide how big you want the astronomical objects to appear by choosing the eyepiece. Even through the two eyepieces included in the astronomy set (4 mm and 20 mm) you will be able to get very different images of the celestial bodies. Would you like to see even more details? Then simply triple the magnification of the eyepiece using the 3x Barlow lens. And should you wish for even more flexibility by means of different magnifications, you will have a large selection of optional eyepieces for your beginner’s telescope. The 31.7mm (1.25 inch) socket diameter corresponds to an international and manufacturer-independent standard.

You don't want to have to lie down underneath the beginner’s telescope for your observations, even though it’s pointed vertically into the sky? You won’t have to, because the 90-degree star diagonal mirror always allows you to look in comfortably. This is also true during the day. For not only the night holds fascinating sights in store for us. That's why you can safely observe the star of our daytime sky with the solar filter: the Sun. So enjoy marvelling at fascinating granulation and sunspots.

CAUTION: Never point the telescope at the Sun without the solar filter!

Anyone who makes impressive observations naturally wants to capture and share them. That's why you can easily use the smartphone adapter to take fascinating snapshots of the Moon, the Sun and other amazing objects with your mobile phone camera. Perfect as a first step into the exciting world of astrophotography!

FEATURES
Beginner’s telescope with 90 mm aperture and 900 mm focal length
Achromatic refractor type Fraunhofer
For observing the Sun, Moon, planets, star clusters and gas nebulae
Height-adjustable tripod
Azimuthally and equatorially usable MPM mount
Precise tracking through flexible shafts and fine adjustment in both axes
Easy to use, good for beginners
Focal ratio F/10, thus sharp image and high contrast
Two eyepieces and one Barlow lens with 31.7 mm (1.25 inch) sockets for different magnifications
Safe solar observation with the included solar filter
Entry into astrophotography with smartphone camera adapter

SCOPE OF DELIVERY
Starter lens telescope
Aluminium tripod
MPM mount
Eyepieces: 4 mm and 20 mm (1.25 inch socket)
Barlow lens 3x (1.25 inch socket)
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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