Product number: GSD980

EUR 1.045,00RRP EUR 1.247,00you save 16.2% (EUR 202,00)


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  • Only 2 pcs left in stock





rating: 4.5 of 5
  • Details..
  • Technical data..
  • In the box..
We are very proud of GSO´s exceptional image quality at a very affordable price.

Thousands of objects are within reach of this 12" Newtonian-style telescope. With its highly refined Dobsonian style mount the telescope is the ideal companion for discerning beginners and for advanced observers alike! A 12" mirror will collect about 44% more light than a 10" mirror. This means that the image is much brighter, and many more objects are within reach. Galaxies will reveal their spiral structure. Planetary nebulae will display splendid detail where a smaller telescope will hardly show anything. The diffraction limited quality optics from GSO will at the same time offer razor sharp images even at high magnifications. Planets and the moon will be seen in great detail. The visibility of details is not limited by the telescope, but rather by observing conditions!

Optical Quality The centerpiece of any telescope is its optics. GSO produces parabolic primary mirrors of very high quality. It is our firm opinion that GSO offers better mirrors than typical in this price range. We guarantee a diffraction-limited performance, which essentially means that the performance is limited by observing conditions and the laws of physics rather than by the telescope itself!


GSO 2" Crayford Focuser: This is one of the best focuser this manufacturer has to offer. It is far superior to most classic rack-and-pinion focusers:
no image shift when focusing
large load capacity: Up to approx. 3kgs with a firm friction setting
1:10 dual speed microfocuser for far improved focusing precision
compression rings for 2" and 1.25" accessories


New Altitude Tension & Balancing System: On most Dobsonian telescopes the altitude bearing is a very simple design. GSO has developed an improved altitude bearing with additional functionality: A strong steel shaft bears the weight of the tube. The tube is guided and kept in position through two CNC machined surfaces. The desired tension can be freely adjusted with a large knurled knob on both sides. This is particularly helpful when changing eyepieces where the telescope is temporarily out of balance.


Balancing System: This is another major improvement of this bearing system. The telescope can be balanced by moving it up or down a couple of centimetres. This may be necessary when adding a second finderscope (e.g. a Telrad) or when using very heavy eyepieces or a binoviewer. A scale on both sides allows you to easily achieve a symmetric bearing position.


Azimuth Roller Bearing: A simple teflon friction bearing used by some other manufacturers (also by GSO in the past) offers a rather stiff motion that makes tracking at high magnifications difficult. This becomes particularly obvious when the telescope is pointed near the zenith so that the lever arm becomes very short. In this position tracking is almost impossible in some Dobsonians!

The new GSO Dobsonians have a modern industrial roller bearing for a very easy movement. Metal plates above and below the bearing prevent the rollers from sinking into the softer wood of the rocker box, so the movement will remain smooth even after years of use.


Manual: The English manual is also available as PDF, it can be downloaded here.
Aperture:12" / 300mm
Focal Length:1500mm
Focal Ratio:f/5
Main Mirror:BK7 with 94% forced reflection
Optical Quality:Parabolical main mirror - better, than diffraction limited
Resolution:0.38"
Limited Mag:15.4 mag
Secondary mirror obstruction:Only 25%
Tube diameter:356 mm
Tube length:1450 mm
Tube weight:19.5 kg
Rockerbox mount dimensions:Height 640 mm / Diameter 635 mm
Rockerbox mount weight:13,5 kg
Collimation:Center Mark on the main mirror
GSO Dobsonian Telescope
Fan behind the main mirror
8x50 Finder with achromatic optic
2" Crayford focuser - 1:10 micro - reduction from 2" to 1.25"
30 mm 2" Wide Angle ERFLE with 70° field for good overfiew
9 mm Super Plössl - multicoated
2" 35 mm extension tube
eyepiece and accessory tray for eyepieces and filters
Collimation manual



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Reviews

Written by Marcel Eckhard
on 2021-11-04

"Das Teleskop macht einen hochwertigen Eindruck und es ist genauso wie ich es mir vorgestellt habe. Bisher konnte ich schon atemberaubende Objekte unseres wunderschönen Universums einfangen. Das, was ich mir nicht vorstellen konnte, ist, dass wenn man ein Objekt ausmacht und dann plötzlich durch das Okular sieht, es so umwerfendes Gefühl ist. Große Empfehlung! (Natürlich muss man dabei bedenken, dass ein Teleskop dieser Größe einen gewissen Platz benötigt und auch nicht gerade handlich oder leicht ist. Das lässt sich bei dieser Öffnungsgröße jedoch nicht ändern.)"

Written by Tomas Langhout
on 2021-08-25

"My first telescope and the views are astonishing! I am amazed by what I can see, highly recommendable."

Written by Stefan Korth
on 2020-02-09

"Beim ""First Light"" war ich noch geschockt - äußerst bizarre Sternabbildung trotz 1a-Justage. Aber da waren wohl Luftfeuchte und starker Frost die Übeltäter, denn beim ""Second Light"" war alles in Ordnung. Geräteaufbau war unproblematisch, mein erster Ausflug zu Mond und ein paar Messier-Sternhaufen auch sehr zufriedenstellend. Das Objekteinstellen geht mit Brille und dem 7x50 - Sucher gewohnt fix, Nachschubsen und Fokussieren auch bei 170x kein Problem. Auskühlen von Optik und Tubus kein Thema bei mir, ich kann es 1-2 Stunden vor Beobachtung schon ein den Garten stellen. Nun geht´s an ergänzendes Zubehör... ***"

Written by Hermann Schwarzer
on 2018-07-24

"Vor meiner Kaufentscheidung hatte ich mich in ihrem Laden zweimal beraten lassen. Die Beratungsgespräche waren für mich sehr hilfreich und kompetent. Auch wenn die Beratung sich hauptsächlich auf kurzbrennweitige 10? Teleskope bezog, habe ich mich als Anfänger für ein 12? Dobsen mit 150cm Brennweite von GSO entschieden. Ich hatte solche Teleskope zwar schon in ihrer Ausstellung angesehen. Wenn es aber dann Zuhause steht, folgt erst mal der Schock. Monstermäßig. Die Lieferung erfolgte problemlos bereits zwei Tagen nach der Bestellung. Auch die Bezahlung über PayPal war unkompliziert. Nachdem ich das Untergestell etwas modifiziert hatte (Viereckig mit Rollen drunter) konnte ich das Teleskop die zweite Nacht gleich auf der Terrasse ausprobieren. Jupiter stand hoch genug, um einige der Wolkenbänder deutlich zu erkennen. In den folgenden Nächten mit einigermaßen guten Luftbedingungen konnte ich sowohl den großen roten Fleck als auch einen Mondaufgang beobachten. Die Qualität der Abbildung ist durchaus vergleichbar mit dem, was ich vorher in der Sternwarte in Tirschenreuth an einem Profi-Refraktor und am dortigen 60cm-Spiegel beobachten konnte. Das einzige Manko bisher ist, dass ich mit meiner Spiegelreflexkamera nicht direkt in den Fokus komme. Mit der Hoffnung auf viele sterneklare Nächte. "

Written by Christian Kraus
on 2017-01-19

"Fur planeten und galaxyn beobachtungen"

Written by Diego Vecchiet
on 2016-04-10

"very fine !"