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GSD980

GSO Guan Sheng Optical
in stock
GSO Dobsonian 980 - 12" - 300/1500mm Telescope - Deluxe


798,00 EUR
incl. 19 % Tax
excl.Shipping costs


Description

GS980 - 12" f/5 Dobsonian by GSO - Aperture: 300mm - Focal length: 1500mm
The Dobsonian with much "Deep Sky power" - with 94% enhanced coating

GSD980 12

Join the growing number of happy users of GSO quality telescopes! 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!

Special Feature & Accessory Package:
-- precisely figured, diffraction limited BK7 primary mirror
-- computer optimized 9-point main mirror cell
-- rigid metal tube for stability of collimation
-- 2" Crayford focuser, dual speed 1:10. "the manufacturer's best focuser"
-- powerful 8x50 finderscope, multicoated objective lens. This little telescope will show many objects in direct vision for easy location.
-- 2" wide angle eyepiece ERFLE 30mm - for a very large true field of view
-- Plossl eyepiece 9mm for a sharp image with medium magnification, e.g. for Planets and the moon.
-- rocker-box mount for smooth movement in both axes
-- innovative new friction and balance bearing in altitude. Improved functionality when compared with a classic altitude bearing.
-- 94% enhanced coating for a brighter image

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!
Dual speed Crayford focuserGSO 2" Crayford Focuser:

In our opinion, this is 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 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.
Computer-optimized main mirror cell

The 12" GSO dobsonians have a computer-optimized 9 point main mirror cell completely machined from metal.
Technical details:

-- Aperture: 300mm / Focal length: 1500mm / Focal ratio: f/5
-- Main mirror substrate: BK7
-- Optical precision: Diffraction limited or better
-- Resolution: 0.38"
-- Limiting visual magnitude: 15m4
-- Max. true field: 1.8°
-- Secondary obstruction: 25%
-- Tube diameter: 365mm
-- Tube length: 1450mm
-- Tube weight: 19.5 kgs
-- Rocker box dimensions: height 64cm / diameter 63,5cm
-- Rocker box weight: 13.5 kgs

Scope of delivery:

Rollenlager

Azimuth roller bearing

Erfle
2" WA ERFLE eyepiece

Plössl
9mm Super Plössl eyepiece

Auszug
2" dual speed Crayford focuser with 1.25" reducer

Sucher
Powerful 8x50 viewfinder


-- GSO Dobsonian with diffraction limited optics
-- Main mirror fan with battery box (batteries not supplied)
-- Eyepiece tray
-- Main mirror center mark for quick & easy collimation


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