|
Telescope-Service - Your Expert for Telescopes, Mounts, Binoculars, Spotting Scopes and Accessories. We offer a broad selection of eyepieces, filters, accessories for astro-imaging and many more interesting items.
|
|
Dobsonian Telescopes |
| Easy Payment: We offer our customers several easy and fast payment methods. You will receive exact payment details when ordering or on request! |
| Dobsonian Telescopes sorted by Manufacturer |
A Few General Notes on Dobsonian Telescopes
| Sooner or later all amateur astronomers face the same dilemma: They want the biggest telescope they can get their hands on (since, as they say, "Aperture can only be replaced by even more aperture"), but their finances draw the line terribly soon. This is partially due to the inherent expenses for high-quality optics, but also due to the fact that a large telescope also requires a heavy - and expensive! - mount to carry it. John Dobson (being in a monastery) faced a similar problem in the 1970's and therefore constructed and built several telescopes of a radically new design. To put it all in a nutshell, he cut out everything the telescope could spare and still remain a functional telescope. The result was the "Dobsonian telescope": A large Newtonian optical tube (Dobson actually ground and figured the mirrors himself!) mounted in what is little more than a box of wood. There are no fancy setting circles, worm gears or motor drives. You basically put all your money into big, good quality optics. The result are very large aperture telescopes at a fraction of the cost of most conventional models! The Dobsonian telescope design is by many considered to be the ultimate, no-nonsense telescope. It will show you extraordinary details in all fields of visual astronomy, especially deep-sky observations (that is: observations of faint objects like galaxies, gas nebulae and the like). Still, you have to be aware that there is (in fact, that there must be!) also a limitation: Dobsonian telescopes are by design not suited for any kind of astronomical photography. Fortunately there is a way to make your dobsonian telescope fit for astronomical photography. You take the optical tube and put it on an equatorial mount. The drawback: Obviously this means that you will need a big and heavy, and therefore expensive, mount to do that. Consider this whenever you want to buy a Dobsonian telescope and do not rule out astronomical imaging! |
Please send requests or online orders to: sales@teleskop-service.se
----------------------------------------------------------------------------------------------------------------------------------------------------------------
GSO Dobsonian 200E - Aperture 200mm - Focal Length 1200mm
A low-budget, excellent quality entry into the world of 20cm telescopes!
|
|

| GSD 200E - Aperture 200mm - Focal Length 1200mm Within our GSO Dobsonian line this particular model serves a very clear purpose: To offer a large aperture and an excellent image quality at as low a price as possible. The value for money is fabulous. At the same time the optical and mechanical quality is at the same high standard that our customers have learned to respect in all GSO Dobsonians! Innovative features like the primary mirror cooling fan and azimuth roller bearing top off the excellent package of our 8" GSO Dobsonian. Gas Nebulae and Galaxies in Detail The Moon and the Planets Grab-And-Go Setup |
| Using the Dobsonian Mount The mount of a Dobsonian telescope is called "Rocker-Box", a fitting name for the uniquely simple and well-working design. The rocker allows you to point the telescope at any point in the sky and allows for comfortable, intuitive movement. Moving the telescope is very simple, just push the telescope into the right direction no need to use clamps or motors, it doesn't get more simple than this! Despite its simple design you will be able to track objects precisely even at high magnifications. With a little experience 250x (the recommended maximum magnification with this telescope) is no problem at all. |
![]() |
![]() |
![]() |
| Cooling Fan for the Primary Mirror (optional) All large Dobsonian telescopes need some time for cool-down. With special (and expensive!) mirror substrates you can reduce this problem, but the cool-down time will not be much shorter. Our GSD 200e can be equipped with an innovative new cooling-fan that effectively reduces the cool-down time by half! The cooling-fan is powered with normal batteries. |
Azimuth Roller Bearing (optional) No more hard-going movements in azimuth! Our GSD 200e can be equipped with a professional roller bearing and two metal plates. Movement in azimuth thus becomes much smoother - and if you want it a little less easy-going just put two felt pads between the bottom plates of the rocker-box. You can choose yourself how much resistance there should be! |
Thin Four-Arm Spider Our GSO Dobsonians do not have the old-fashioned thick three-arm spider as many other telescopes of this size have. With its four thin spider vanes the contrast is extremely high! |
|
|
|
|
||||||||||||
|
Smooth 2" Focuser |
Spring-Tension-System |
|
|
GSO Dobsonians are no one-way street! Dobsonian telescopes are ideally suited for visual use - with no other telescope design will you get this amount of observing fun for your budget! Astronomical imaging on the other hand is barely possible with any Dobsonian telescope. Only the very brightest objects (the sun with the proper filter, the moon, the brightest planets) can be photographed without a tracking motor. Deep-sky objects (galaxies, gas nebulae) require long exposure times and consequently a solid equatorial mount. Two Telescopes in One Our idea was quite simple: As long as you desire just to enjoy the beauty of the various celestial objects and joyful hours behind your eyepiece you should set up the GSO Dobsonian as it is - as a Dobsonian telescope. Setup takes only a few seconds and you will be observing in no time. Also, this combination is very portable. For astronomical imaging or the comfort of a tracking motor just attach the cradle rings and put the tube on an equatorial mount. (see image to the left) Our recommendation: The Celestron ADM is a solid mount that will carry your 200mm "Newtonian" with good stability. For astro-imaging we offer a well working dual axis motor-drive. This combination will bring much joy to your astrophotographical ambitions. More details on the ADM Many other interesting mounts can be found here. |
|
Please send requests or online orders to: sales@telescope-service.com |
Prices
|
|
|
The TS Eyepiece and Accessory Case isn't just an assortment of randomly picked eyepieces, we have put a lot of thoughts into choosing a fine range of eyepieces that will work with nearly all telescopes. These great eyepieces are included in the TS eyepiece and accessory case: - three excellent quality TS Super Plossl eyepieces - one TS wide angle eyepiece - our excellent TS Barlow lens (2x/1.5x) - five carefully chosen TS colour filters and one grey moon filter (not just a cheap green filter) - an adaptor for focal and eyepiece projection astro-imaging All comes in a beautiful, foam-lined aluminium case .......... Link to further information |
Please send requests or online orders to: sales@teleskop-service.se
----------------------------------------------------------------------------------------------------------------------------------------------------------------
GSO Dobsonian 200 - Aperture 203mm - Focal Length 1200mm - With Cooling Fan
High quality accessories: 2" Crayford focuser, wide angle eyepiece, roller bearing, ...

This telescope has particularly good quality accessories.
|
Gas Nebulae and Galaxies in Detail The Moon and the Planets Grab-And-Go Setup GSD 200 - Aperture 200mm - Focal Length 1200mm |
| Using the Dobsonian Mount The mount of a Dobsonian telescope is called "Rocker-Box", a fitting name for the uniquely simple and well-working design. The rocker allows you to point the telescope at any point in the sky and allows for comfortable, intuitive movement. Moving the telescope is very simple, just push the telescope into the right direction no need to use clamps or motors, it doesn't get more simple than this! Despite its simple design you will be able to track objects precisely even at high magnifications. With a little experience 250x (the recommended maximum magnification with this telescope) is no problem at all. Back-Focus The Dobsonian was designed with sufficient back-focus for SLR cameras. At the same time you will find focus with most common eyepieces. Some eyepieces with a low field stop might need to be pulled out of the focuser by a little margin in order to reach focus. If you do not wish to do that you can buy the optional 35mm extension tube. |
|
|
Specifications
|
![]() |
![]() |
![]() |
| Excellent Crayford 2" Focuser & Red. 1.25" the Crayford focuser has zero image shift and offers very smooth focus motion. Including 1.25" adaptor. Both 2" and 1.25" with brass compression ring...... further information |
High Quality Accessories & Eyepiece Tray |
8x50 Finderscope with Quick Release Bracket The achromatic objective is multi-coated for a brighter image. |
![]() |
![]() |
![]() |
| Thin 4-Vane Spider - More Contrast The less diffraction the better the contrast. Thin secondary spider vanes improve contrast compared with cheap three vane or thick four vane spiders - important for the moon and the planets |
Industrial Roller Bearing for Azimuth - Not Just a Simple Friction Bearing The roller bearing makes moving the telescope in azimuth much easier. If you want more friction simple felt pads will do the trick. |
Spring Tension System The spring tension system prevents the telescope from moving on its own when exchanging eyepieces. |
|
|
GSO Dobsonians are no one-way street! Dobsonian telescopes are ideally suited for visual use - with no other telescope design will you get this amount of observing fun for your budget! Astronomical imaging on the other hand is barely possible with any Dobsonian telescope. Only the very brightest objects (the sun with the proper filter, the moon, the brightest planets) can be photographed without a tracking motor. Deep-sky objects (galaxies, gas nebulae) require long exposure times and consequently a solid equatorial mount. Two Telescopes in One Our idea was quite simple: As long as you desire just to enjoy the beauty of the various celestial objects and joyful hours behind your eyepiece you should set up the GSO Dobsonian as it is - as a Dobsonian telescope. Setup takes only a few seconds and you will be observing in no time. Also, this combination is very portable. For astronomical imaging or the comfort of a tracking motor just attach the cradle rings and put the tube on an equatorial mount. (see image to the left) Our recommendation: The Celestron ADM is a solid mount that will carry your 200mm "Newtonian" with good stability. For astro-imaging we offer a well working dual axis motor-drive. This combination will bring much joy to your astrophotographical ambitions. More details on the ADM Many other interesting mounts can be found here. |
| Primary Mirror Substrates BK-7 and Suprax The image quality itself is not affected by the mirror substrate. Likewise cooldown-time is nearly the same regardless of which of these substrates you choose. The integrated cooling fan shortens the cool-down time considerably. The only difference between the mirrors is the image quality during cool-down (between 15 and 45 minutes, depending on the ambient temperature). BK-7 reacts about twice as strongly as Suprax. This means that you can use higher magnifications sooner with a Suprax mirror. Suprax has roughly comparable thermic properties as Pyrex. Once cool-down is complete there is no difference in optical quality. |
|
Please send requests or online orders to: sales@telescope-service.com |
Prices
|
|
|
The TS Eyepiece and Accessory Case isn't just an assortment of randomly picked eyepieces, we have put a lot of thoughts into choosing a fine range of eyepieces that will work with nearly all telescopes. These great eyepieces are included in the TS eyepiece and accessory case: - three excellent quality TS Super Plossl eyepieces - one TS wide angle eyepiece - our excellent TS Barlow lens (2x/1.5x) - five carefully chosen TS colour filters and one grey moon filter (not just a cheap green filter) - an adaptor for focal and eyepiece projection astro-imaging All comes in a beautiful, foam-lined aluminium case .......... Link to further information |
----------------------------------------------------------------------------------------------------------------------------------------------------------------
Economy Line - GSD 250C - Aperture 250mm - Focal Length 1250mm
Economy line GSO Dobsonian with good 2" accessories

|
GSD 250 C - a powerful and very affordable telescope not only for observing the deep sky objects, but also for observing the planets with high contrast.
The image still shows the old rack and pinion focuser which has now been replaced by the better Crayford focuser. |
![]() Now the GSD 250 C comes with a good quality Crayford focuser for extra-smooth focus motion. |
GSD 250 C Why should you sacrifice quality only because you want to save money? The GSO Economy line was created to offer Dobsonian telescopes as cheap as possible without reducing the quality of the optics. In our opinion the result is an excellent telescope at an exceptional value for money. Optical Performance Simple Operation |
|
|
Specifications
|
![]() |
![]() |
![]() |
| Thin 4-Vane Spider - More Contrast The less diffraction the better the contrast. Thin secondary spider vanes improve contrast compared with cheap three vane or thick four vane spiders - important for the moon and the planets |
Industrial Roller Bearing for Azimuth - Not Just a Simple Friction Bearing The roller bearing makes moving the telescope in azimuth much easier. If you want more friction simple felt pads will do the trick. |
Spring Tension System The spring tension system prevents the telescope from moving on its own when exchanging eyepieces. |
|
Please send requests or online orders to: sales@telescope-service.com |
Prices
|
|
|
The TS Eyepiece and Accessory Case isn't just an assortment of randomly picked eyepieces, we have put a lot of thoughts into choosing a fine range of eyepieces that will work with nearly all telescopes. These great eyepieces are included in the TS eyepiece and accessory case: - three excellent quality TS Super Plossl eyepieces - one TS wide angle eyepiece - our excellent TS Barlow lens (2x/1.5x) - five carefully chosen TS colour filters and one grey moon filter (not just a cheap green filter) - an adaptor for focal and eyepiece projection astro-imaging All comes in a beautiful, foam-lined aluminium case .......... Link to further information |
Please send requests or online orders to: sales@teleskop-service.se
----------------------------------------------------------------------------------------------------------------------------------------------------------------
GSD 250 - Aperture 250mm - Focal Length 1250mm - With Integrated Cooling Fan

With an aperture of 250mm this telescope is a very popular combination of light-gathering power and portability.
|
|
10 inches (250mm) of aperture make this telescope a Deep-Sky big gun. The TS WA 30mm 2" wide angle eyepiece offers a far larger true field of view than is possible with any 1.25" eyepiece. That is particularly important for viewing gas nebulae and galaxies. The secondary mirror obstruction is around 25%. This means that the GSD 250 is also well suited for lunar and planetary observations. Under good seeing conditions you will see plenty of craters, ridges and mountain ranges on the moon in finest detail. Planets, too, will make for innumerable joyful observing hours. You will see finest structures in Saturn's rings and many surface details on Mars. The telescope's large aperture brings along much easier to see colours, e.g. on Jupiter. The 12mm Super Plossl eyepiece which is in the standard scope of delivery offers an excellent contrast. Despite all the telescope can easily be handled by one person - it will fit on the backseats of most small cars. The GSD 250 is another sample of what I call "astronomical plug and play". Set-up and collimation take less than five minutes for experienced amateurs, you can launch into the observing session right away. Please see the General Notes on Dobsonian Telescopes to find out why a Dobsonian might be just the telescope for you! |
| Using the Dobsonian Mount The mount of a Dobsonian telescope is called "Rocker-Box", a fitting name for the uniquely simple and well-working design. The rocker allows you to point the telescope at any point in the sky and allows for comfortable, intuitive movement. Moving the telescope is very simple, just push the telescope into the right direction no need to use clamps or motors, it doesn't get more simple than this! Despite its simple design you will be able to track objects precisely even at high magnifications. With a little experience 250x (the recommended maximum magnification with this telescope) is no problem at all. Back-Focus The Dobsonian was designed with sufficient back-focus for SLR cameras. At the same time you will find focus with most common eyepieces. Some eyepieces with a low field stop might need to be pulled out of the focuser by a little margin in order to reach focus. If you do not wish to do that you can buy the optional 35mm extension tube. |
|
|
Specifications
|
![]() |
![]() |
![]() |
| Excellent Crayford 2" Focuser & Red. 1.25" the Crayford focuser has zero image shift and offers very smooth focus motion. Including 1.25" adaptor. Both 2" and 1.25" with brass compression ring...... further information |
High Quality Accessories & Eyepiece Tray |
8x50 Finderscope with Quick Release Bracket The achromatic objective is multi-coated for a brighter image. |
![]() |
![]() |
![]() |
| Thin 4-Vane Spider - More Contrast The less diffraction the better the contrast. Thin secondary spider vanes improve contrast compared with cheap three vane or thick four vane spiders - important for the moon and the planets |
Industrial Roller Bearing for Azimuth - Not Just a Simple Friction Bearing The roller bearing makes moving the telescope in azimuth much easier. If you want more friction simple felt pads will do the trick. |
Spring Tension System The spring tension system prevents the telescope from moving on its own when exchanging eyepieces. |
|
|
GSO Dobsonians are no one-way street! Dobsonian telescopes are ideally suited for visual use - with no other telescope design will you get this amount of observing fun for your budget! Astronomical imaging on the other hand is barely possible with any Dobsonian telescope. Only the very brightest objects (the sun with the proper filter, the moon, the brightest planets) can be photographed without a tracking motor. Deep-sky objects (galaxies, gas nebulae) require long exposure times and consequently a solid equatorial mount. Two Telescopes in One Our idea was quite simple: As long as you desire just to enjoy the beauty of the various celestial objects and joyful hours behind your eyepiece you should set up the GSO Dobsonian as it is - as a Dobsonian telescope. Setup takes only a few seconds and you will be observing in no time. Also, this combination is very portable. For astronomical imaging or the comfort of a tracking motor just attach the cradle rings and put the tube on an equatorial mount. (see image to the left) Our recommendation: The EQ-6 is a solid mount that will carry your 250mm "Newtonian" with good stability. A photographical variant of this mount is available. It offers a better tracking precision. This combination will bring much joy to your astrophotographical ambitions. More details on the EQ-6 |
| Primary Mirror Substrate BK-7 The image quality itself is not affected by the mirror substrate. Likewise cooldown-time is nearly the same regardless of which substrate the mirror is (as opposed to the common myth to the contrary). The integrated cooling fan shortens the cool-down time considerably. The only difference between the mirrors is the image quality during cool-down (between 15 and 45 minutes, depending on the ambient temperature). For this reason we have chosen BK-7 as standard mirror substrate for our GSO Dobsonians. We figure that the actual gain in performance is in no reasonable relation to the extra cost of more exotic mirror substrates. |
|
Please send requests or online orders to: sales@telescope-service.com |
Prices
|
|
|
The TS Eyepiece and Accessory Case isn't just an assortment of randomly picked eyepieces, we have put a lot of thoughts into choosing a fine range of eyepieces that will work with nearly all telescopes. These great eyepieces are included in the TS eyepiece and accessory case: - three excellent quality TS Super Plossl eyepieces - one TS wide angle eyepiece - our excellent TS Barlow lens (2x/1.5x) - five carefully chosen TS colour filters and one grey moon filter (not just a cheap green filter) - an adaptor for focal and eyepiece projection astro-imaging All comes in a beautiful, foam-lined aluminium case .......... Link to further information |
Please send requests or online orders to: sales@teleskop-service.se
----------------------------------------------------------------------------------------------------------------------------------------------------------------
Economy Line - GSD 300E - Aperture 300mm - Focal Length 1500mm
Economy line GSO Dobsonian with good 2" accessories

![]() |
Optical Performance Simple Operation Why should you sacrifice quality only because you want to save money? The GSO Economy line was created to offer Dobsonian telescopes as cheap as possible without reducing the quality of the optics. In our opinion the result is an excellent telescope at an exceptional value for money. |
|
|
Specifications
|
|
Please send requests or online orders to: sales@telescope-service.com |
Prices
|
|
|
The TS Eyepiece and Accessory Case isn't just an assortment of randomly picked eyepieces, we have put a lot of thoughts into choosing a fine range of eyepieces that will work with nearly all telescopes. These great eyepieces are included in the TS eyepiece and accessory case: - three excellent quality TS Super Plossl eyepieces - one TS wide angle eyepiece - our excellent TS Barlow lens (2x/1.5x) - five carefully chosen TS colour filters and one grey moon filter (not just a cheap green filter) - an adaptor for focal and eyepiece projection astro-imaging All comes in a beautiful, foam-lined aluminium case .......... Link to further information |
Please send requests or online orders to: sales@teleskop-service.se
----------------------------------------------------------------------------------------------------------------------------------------------------------------
GSD 300 - Aperture 300mm - Focal Length 1500mm

The Flagship of our GSO Dobsonian line: The GSD 300.
|
|
Der GSD 300 bietet durch seine große
Öffnung spektakuläre Ausblicke ins All. Beobachtungen mit dem GSD 300 Feinstrukturen in Gasnebeln und Galaxien, wie man sie sonst nur von Aufnahmen her kennt, können Sie bereits live sehen. Ferne Galaxienhaufen sind ebenfalls in der Reichweite dieses leistungsstarken Newtons. Kugelsternhaufen unserer Galaxie werden bereits bis ins Zentrum in Einzelsterne aufgelöst. Supernova Überreste, wie der Cirrus Nebel, zeigen eine Fülle feinster Filamente. Mond und Planeten werden Ihnen, bei ruhiger Luft, viele Details, auch in Farbe, zeigen können. Strukturen in den Saturn Ringen oder die Monde des Jupiter als unterschiedlich große Scheibchen sind, wenn alle Umfeldbedingungen passen, kein Problem für die genaue Qualitäsoptik dieses Gerätes. Die Bedienung ist noch von einer Person möglich. Für den Transport braucht man aber zumindest einen Kombi, da dieses Gerät nicht mehr auf der Rückbank eines Kleinwagens Platz findet. Der Aufbau selbst ist sehr einfach, binnen weniger Minuten ist das Gerät einsatzbereit. |
| Using the Dobsonian Mount The mount of a Dobsonian telescope is called "Rocker-Box", a fitting name for the uniquely simple and well-working design. The rocker allows you to point the telescope at any point in the sky and allows for comfortable, intuitive movement. Moving the telescope is very simple, just push the telescope into the right direction no need to use clamps or motors, it doesn't get more simple than this! Despite its simple design you will be able to track objects precisely even at high magnifications. With a little experience 250x (the recommended maximum magnification with this telescope) is no problem at all. Back-Focus The Dobsonian was designed with sufficient back-focus for SLR cameras. At the same time you will find focus with most common eyepieces. Some eyepieces with a low field stop might need to be pulled out of the focuser by a little margin in order to reach focus. If you do not wish to do that you can buy the optional 35mm extension tube. |
|
|
|
![]() |
![]() |
![]() |
| Excellent Crayford 2" Focuser & Red. 1.25" the Crayford focuser has zero image shift and offers very smooth focus motion. Including 1.25" adaptor. Both 2" and 1.25" with brass compression ring...... further information |
High Quality Accessories & Eyepiece Tray |
8x50 Finderscope with Quick Release Bracket The achromatic objective is multi-coated for a brighter image. |
![]() |
![]() |
![]() |
| Thin 4-Vane Spider - More Contrast The less diffraction the better the contrast. Thin secondary spider vanes improve contrast compared with cheap three vane or thick four vane spiders - important for the moon and the planets |
Industrial Roller Bearing for Azimuth - Not Just a Simple Friction Bearing The roller bearing makes moving the telescope in azimuth much easier. If you want more friction simple felt pads will do the trick. |
Spring Tension System The spring tension system prevents the telescope from moving on its own when exchanging eyepieces. |
|
|
GSO Dobsonians are no one-way street! Dobsonian telescopes are ideally suited for visual use - with no other telescope design will you get this amount of observing fun for your budget! Astronomical imaging on the other hand is barely possible with any Dobsonian telescope. Only the very brightest objects (the sun with the proper filter, the moon, the brightest planets) can be photographed without a tracking motor. Deep-sky objects (galaxies, gas nebulae) require long exposure times and consequently a solid equatorial mount. Two Telescopes in One Our idea was quite simple: As long as you desire just to enjoy the beauty of the various celestial objects and joyful hours behind your eyepiece you should set up the GSO Dobsonian as it is - as a Dobsonian telescope. Setup takes only a few seconds and you will be observing in no time. Also, this combination is very portable. For astronomical imaging or the comfort of a tracking motor just attach the cradle rings and put the tube on an equatorial mount. (see image to the left) |
| Primary Mirror Substrates BK-7 and Suprax The image quality itself is not affected by the mirror substrate. Likewise cooldown-time is nearly the same regardless of which of these substrates you choose. The integrated cooling fan shortens the cool-down time considerably. The only difference between the mirrors is the image quality during cool-down (between 15 and 45 minutes, depending on the ambient temperature). BK-7 reacts about twice as strongly as Suprax. This means that you can use higher magnifications sooner with a Suprax mirror. Suprax has roughly comparable thermic properties as Pyrex. Once cool-down is complete there is no difference in optical quality. |
|
Please send requests or online orders to: sales@telescope-service.com |
Prices
|
|
|
The TS Eyepiece and Accessory Case isn't just an assortment of randomly picked eyepieces, we have put a lot of thoughts into choosing a fine range of eyepieces that will work with nearly all telescopes. These great eyepieces are included in the TS eyepiece and accessory case: - three excellent quality TS Super Plossl eyepieces - one TS wide angle eyepiece - our excellent TS Barlow lens (2x/1.5x) - five carefully chosen TS colour filters and one grey moon filter (not just a cheap green filter) - an adaptor for focal and eyepiece projection astro-imaging All comes in a beautiful, foam-lined aluminium case .......... Link to further information |
Please send requests or online orders to: sales@teleskop-service.se
Errors and Omissions Excepted