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GSIMN8CAM

GSO Guan Sheng Optical
in stock
GSO 200mm f/4 Newtonian on Celestron Advanced GoTo mount


988,00 EUR
incl. 19 % Tax
excl.Shipping costs


Description
GSO Newtonian 200/800mm on Celestron CAM advanced GoTo mount
Aperture 200mm / Focal Length 800mm / f/4 - on Celestron advanced GoTo mount - with 94% enhanced coating

GSO 200-1000mm Newton w/ GOTO CAM


Most opticians worldwide will agree: The shorter the focal length of a Newtonian primary mirror at a given diameter, the more difficult it is to make. This is probably the main reason why there are not many f/4 Newtonians around despite their obvious advantages for astro-imaging!
GSO is famous for their excellent quality optics which are in our opinion much better than the Chinese standard. For us GSO is one of very few manufacturers in this price range who we trust in when it comes to f/4 parabolical primary mirrors!

Teleskop-Service guarantees a diffraction limited performance for all our GSO telescopes. Experience shows that the telescopes are even better than this usually!
We do careful tests of all shipments so that we can guarantee a constantly high level of quality.

Fields of Use of the GSN 2008
The incredibly "fast" f/4 optical system makes this an excellent rich field telescope. It is equally well suited for observing faint nebulae and galaxies.
At the same time, used with a good (optional) coma corrector, this telescope resembles a high class instrument for astro-imaging.

Link to the GSO coma correktor for Newtonians

The massive Celestron advanced GoTo mount:

Celestron advanced GoTo mount

The CAM is a very accurate and rugged GoTo Mount, for advanced observing and astrophotography. The CAM is mechanically very rugged and uses the same software which is used on the Celestron CGE mount.

In our opinion the GoTo controller of the CAM is one of the best and most userfriendly controllers on the market.

The CAM offers among other features:

-- Software assisted Polar Alignment
-- PEC, Declination backlash compensation, Autoguiding
-- A very intuitive menu
-- Extensive manual
More information about the Celestron Advanced GoTo Mount CAM

Visual Use
Because of this telescopes exceptional optical quality and the optimized secondary mirror holder (very thin spider vanes for minimal diffraction effects) image contrast is very high, even for planets and moon. In our opinion image sharpness is better than that of many other telescopes of equal aperture.

Its primary use is of course deep sky observations, i.e. galaxies, gas nebulae, star clusters etc. With its great aperture of 200mm the telescope offers an enormous light gathering power. At the same time it is very compact due to its short focal length. Higher magnifications can be achieved using good quality modern eyepieces.

Astro-Imaging
This is the strongest point of this wonderful telescope. With its very short focal ratio of f/4 exposure times are much shorter than with longer focal ratios (about 2/3 of that with a classical f/5 Newtonian). This makes the telescope perfectly suited for deep sky imaging. You can use strong filters to boost contrast and will nonetheless have relatively short exposure times.

Aside from the optical quality the mechanics must also be good for successful astro-imaging. With its excellent quality ultra-smooth 2" Crayford focuser this telescope offers a lot of comfort.

For deep sky astro-imaging we recommend to use a coma corrector. This will also add a few millimeters to the back-focus of this telescope to accomodate SLR cameras.

Very Precise and Rigid 2" Crayford Style Focuser - 1:10
The focuser is an important part of any telescope. If the focuser is good the telescope's full potential can be used. If the focuser is not good you might have trouble attaining a sharp image, no matter how good the optics would be!

For the GSN 2008 we have used an excellent 2" Crayford style focuser with integrated 1:10 dual speed microfocuser. These focusers have zero image shift and move very smoothly. With a bit of experience you can do such small focus movements as 0.08mm!

Primary Mirror Cooling Fan
Instead of chosing exotic and incredibly expensive mirror substrates we have chosen to equip this telescope with a primary mirror cooling fan to accelerate cool-down time to ambient temperature. Until a mirror is properly cooled down it will create currents of warm air that will deteriorate the image - no matter which mirror substrate is used. Only after the mirror has cooled down this effect stops.

Parabolical Primary Mirror
The very precisely figured parabolical primary mirror of this telescope is not made of cheap float glass, but rather of BK-7 optical glass that is free of internal stress. Thermic properties are generally better than float glass. At the same time the mirror is way more affordable than more exotic primary mirror substrates that in our opinion bring hardly any advantage at all (see comments under "Primary Mirror Cooling Fan"). For easier collimation the mirrors are properly center marked.

Finderscope of the GSN 2008
This is another detail which needs to be given the proper attention. An inadequate finderscope will make everything a lot more difficult for the user. For this reason we are supplying the GSN with an 8x50 achromatic finder with multi-coated lens and a good image sharpness throughout the field. Of course the finder also has a crosshair inside. My rotating the objective lens cell you can focus the finder precisely. With an aperture of 50mm several deep sky objects are already directly visible

Scope of delivery:

-- GSO Newtonian 200/800mm
-- Tube rings and prism rail PS21
-- GoTo mount CAM with two counterweights
-- Eyepiece Plössl 25mm
-- 8x50 finder with quick-release bracket
-- 2" extension tube to reach foucus with all eyepieces

Technical details:
Optical system: 200mm / 800mm / f/4
Main mirror:parabolic, with center mark
Secondary mirror:Ø 70 mm (minor axis)
Focuser:2" Crayford with 1:10 dual speed, 1.25" reducer and brass clamping ring
Finder8x50 achromat with cross-hair section and quick-release bracket
OTA weight:8.7 kgs with tube rings and finder
Tube dimensions / material:Ø 230mm - length 730mm / metal
Mount:Celestron Advanced GoTo German Equatorial mount
TripodSteel-tube field tripod, max. height 140 cm

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E-Mail: info@teleskop-service.de · Telefon: +49 (0)89-1892870 · Fax: +49 (0)89-18928710
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