Bresser Quasar 80/900 EQ Refractor Telescope

With this entry-level telescope including plenty of accessories taking a closer look at the sun, moon, planets and many deep-sky objects becomes child's play

Complete set of telescope, tripod, mount and accessories
Easy-to-use refractor telescope for beginners
Fine adjustment with flexible shafts in 2 axes
Telescope aperture: 80 mm / focal length: 900 mm
Excellent for sun, moon, planets and star clusters
Smartphone camera adapter for easy first steps in astrophotography
Plenty of accessories to get started immediately
Safe aperture solar filter

Take a closer look at the wonders of the universe. This complete telescope set for beginners contains everything you need for your new hobby: a refractor telescope with 80 mm aperture and 900 mm focal length, an equatorial mount, a tripod and a wide range of accessories for astronomical observations. The system is very easy to handle and can even be used by children. Simply unpack, set up and get started – you will be amazed at what you will discover!

Easy start with user-friendly classic – the telescope
The astronomical telescope is a traditional lens telescope, a so-called Fraunhofer achromatic refractor. The advantage of this established telescope type: even beginners and children find it easy to operate. In addition, the BRESSER Quasar scores points for its modern, precisely coated optics with good imaging properties.

A direct comparison shows: With its 80 mm aperture, this telescope already collects 30 % more light than a 70 mm telescope and the resolving power is better as well. This means that you can already marvel at some of the details on Mars through the Quasar. In addition, 80 mm aperture and 900 mm focal length mean a large focal ratio (ratio of the aperture to the focal length) of about 1 to 11.3 (F/11.3). The result: a very sharp image with good contrast. Due to its long focal length the entry-level telescope is a specialist when it comes to observing the moon, sun, planets, open star clusters and globular clusters. But you can also take a look at many gas nebulae through this telescope, such as the famous Orion Nebula M42 or the Ring Nebula M57.

How big will you see the fascinating celestial bodies? The 80 mm aperture achieves a resolving power that easily allows magnifications of up to about 160x with really sharp images. Technically, much more is possible, theoretically up to 675x using the included accessories. However, with increasing magnification, the sharpness of the image can slowly decrease. In addition to the equipment, the conditions play a role as well: the air turbulence in the atmosphere (seeing conditions) also determines how much you are able to magnify.

Sturdy base for your easy astro-beginning – mount and tripod
Found the perfect spot for your nocturnal explorations? Then install the telescope effortlessly on the height-adjustable aluminium tripod using the equatorial mount. The advantage of this type of mount: unlike the azimuthal models, you compensate for the movement of the celestial bodies along just one axis instead of two. To do this, you align one axis parallel to the Earth's axis, which is called "alignment". This is easily done by pointing it approximately to Polaris. The beginner's telescope also comes with two flexible shafts with a fine adjustment, which simplify the movement of the axes. They make adjusting and tracking very precise and comfortable. Handy storage: On a plate between the tripod legs, you can store your accessories within easy reach.

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!

The complete package for your sky observations – the accessories
The extensive astronomy accessories including a safe solar filter enable you to immediately direct your gaze through the lens telescope to the sky – day and night. When observing at night, the LED viewfinder helps you find your way around: just install it parallel on the telescope, adjust it and use it to align and locate celestial objects. When you look through it, the red dot projected onto a ground-glass screen inside appears to hover in front of the sky. It shows you the spot to which the tube is pointing. This allows you to navigate easily before taking a closer look with the telescope's high magnification.

Different perspectives of your astronomical discoveries are made possible by the two eyepieces, which enable different magnifications. With their sockets, which have a standard diameter of 1.25 inch (31.7 mm), they are simply inserted into the telescope's focuser.
You want to see even more details? Then triple the magnification of the eyepieces with the 3x barlow lens.

Always comfortable while observing the stars – for this purpose the 90-degree star diagonal mirror is included. That way you always enjoy a pleasant view into the telescope. Even if it is pointed upwards into the sky, you can comfortably look in from the side.

Discover the beauty of our own star: Using the telescope in combination with the solar filter you can safely observe sunspots and granulation on the sun. CAUTION: Never point the telescope at the sun without the solar filter!

Have you always been fascinated by astrophotography? Then your smartphone camera and the smartphone adapter will get you started. This way you'll quickly enjoy your first own photos e. g. of the moon or the sun.

FEATURES

Beginner’s lens telescope with 80 mm aperture and 900 mm focal length
Fraunhofer achromatic refractor
Ideal for observing the sun, moon, planets and star clusters
Height-adjustable tripod with equatorial EQ3 mount
Precise adjustment through flexible shafts and fine adjustment in both axes
Easy to use, very suitable for beginners and children
Focal ratio F/11.3, thus very sharp image and high contrast
1.25 inch (31.7 mm) focuser
Two eyepieces and a barlow lens with 1.25 inch (31.7 mm) sockets for different magnifications
Safe solar observation with the included solar filter
First steps in astrophotography with smartphone camera adapter

SCOPE OF DELIVERY

Beginner’s telescope
Aluminium tripod
Equatorial EQ3 mount
Eyepieces: 4 mm und 20 mm (1.25 inch sockets)
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.

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