Bresser Messier 6" Dobsonian Telescope

BRESSER Messier 6" Planetary Dobson Telescope - now including a high-quality aperture Solar-filter for safe observation of sunspots, eclipses and planet transits. Great telescope for night-time and solar observation.

The BRESSER Messier 6 inch Planetary Dobson is something very special. Despite its low price, it offers a variety of functions and quality, which you sometimes look for in vain in considerably more expensive telescopes. With an aperture diameter of 150 mm and a focal length of 1200 mm the high quality BRESSER Newtonian optics, observations of the Moon, the planets and planetary nebulae are particularly impressive. Craters and rilles of the moon, as well as the ever-changing shadows cast by the terminator line between light and dark side of the lunar surface, are exciting targets to explore. Saturn with its impressive ring system, Jupiter with its bands of clouds and the movement of its easily-visible moons, the crescent phase of Venus and the glowing red Mars are good examples of what this telescope can be used to observe with ease. Because of the long basic focal length you can easily achieve high magnifications without especially short focal length eyepieces, making for a more comfortable viewing. You do not need expensive special eyepieces for this. In short, this is a telescope primarily for detailed high power visual observation. Nevertheless, brighter deep sky objects like the Orion Nebula, or the galaxies Messier 81 and 82 etc. can be easily observed as well.

Astrophotography is no problem with this tube. Here is another strength of this telescope: if you want to take pictures, you can simply unscrew the altitude wheels from the tube and mount the telescope to a Equatorial mount, with an optionally available dovetail rail. The included eyepiece adapter has the common T2 connection thread (M42x0.75mm), to which almost every standard camera can be attached. A camera-specific T2 adapter ring is the only other itme required as an additional purchase. Of course, regular USB planetary cameras with 1.25 inch or 2 inch diameters can also be used directly with this telescope. For lunar or planetary imaging, you would not even need a tracking mount to acheive this.

With the standard equipment you can observe with minimal set up time - an optical 6x30 viewfinder and a 25 mm SPL eyepiece are included. For those who want to transport the telescope taking up the least amount of volumetric space, the 6'' BRESSER Messier Planet Dobson makes carriage very easy - the rocker box can be disassembled in a few easy steps, due to the quick release metal furniture connectors. So a bulky rocker box can quickly turn into a handy flat package.

A telescope whose versatility, performance and user-friendliness set new standards in this price class.

Please note that Newtonian reflector telescopes are very good for astronomical observations of the night sky, but are not well-suited for observing nature and landscapes during the day. For nature and landscape observations we recommend BRESSER spotting scopes or refracting telescopes with a terrestial erecting adapter.

FEATURES

Telescope for night and solar observation

High quality BRESSER Newtonian optics

Ideal telescope for planets, moon, double stars and planetary nebulae

Sun observation through the included sun filter possible

Mirror diameter: 150 mm

Focal length: 1200 mm

Aperture ratio: F/8

Stable and smooth 2 inch 50.8mm Rack and Pinion focuser

Main mirror made of special glass with low thermal expansion

Easy to move metal tube for balancing

Demountable rocker box with accessory tray

Tube mounting on altitude wheels using tube clamps

Use of the optics also on other mounts

Different sized adjustment and counter screws on the mirror cell

Viewing height at zenith: approx. 115cm (suitable for children and teenagers)

Tube weight: 8.3 kg

Basic weight: 7.8 kg

Total weight: 16.1 kg

Dimensions ready to use telescope: 45 x 45 x 128 cm

Shipping dimensions 1 carton: 122 x 53 x 35 cm, 22,5 kg

What's Included:

Optical tube

Dobsonian Telescope Mount (disassembled for self assembly)

Aperture Solar Filter

Optical 6x30 viewfinder

25mm SuperPlössl eyepiece (Ø 31.7 mm / 1.25 inch')

1 Extension tube 25mm for 2 inch focuser

1 Eyepiece adapter diameter 31.7 to 50.8 mm

2 Tube clamps

2 Altitude wheels

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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