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TS GSO 8" f/4 Imaging Newtonian Telescope OTA - Optical Tube Assembly

TS GSO 8" f/4 Imaging Newtonian Telescope OTA - Optical Tube Assembly

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Model
GSIMN8
Weight
20.00 kg
RRP:
£399.00
Our price:
£384.00
4%

including VAT 20.00 % ( £64.00 )
Qty



FREE DELIVERY TO UK MAINLAND! (exceptions apply, i.e. Scottish Highlands)

TS 8" f/4 Newtonian Telescope from GSO - optical tube with cradle rings and finder

... aperture 8" - focal lengh 800mm - f/4 with dual speed Crayford focuser
... powerful telescope for observing and astrophotography

GSO 200mm f/4 imaging Newtonian

Newtonian telescopes made by GSO for Teleskop Service have a well known reputation for the highest quality optics available in this price range. Due to the very stable steel tube as well as the precise dual speed crayford focuser the GSO 8" f/4 Newtonian telescope is a strongly recommended combination for astro photography as well as visual observing. We also offer high quality coma correctors for this fast imaging Newtonian telescope.

This GSO Newtonian 200mm f/4 is on of the best solutions in this range. It adds a package of extra features that are in our opinion unparalleled in this class:
-- high definition parabolic primary mirror, better than typical Chinese mirrors
-- thin secondary mirror spider vanes for minimized obstruction
-- larger illuminated field through use of a well-dimensioned secondary mirror (70mm diameter)
-- an ultra-smooth Crayford focuser for much smoother focusing motion and zero image shift.
-- sufficient Back focus allows you to reach focus even with DSLR cameras.
-- 94% enhanced reflection for a brighter image
-- rigid steel tube instead of a wobbly aluminium tube

The rigid 2" Crayford focuser with 1:10 micro transmission is necessary for astrophotography:
Crayford Focuser

For this Newtonian telescope 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!

This GSO dual speed focuser is fully compatible with the TS Motorfocus system, allowing vibration free and easy focusing for high power visual observing or astro-imaging. The Crayford holds eyepieces or cameras with a very good stability.


Ventilated main mirror

Primary Mirror Cooling Fan
Instead of choosing 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.

Parabolic Primary Mirror
The very precisely figured parabolic 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. Thermal 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.

Technical details of the optical tube:
-- Aperture 200mm (8") / focal length 800mm / photographic speed f/4
-- 94% enhanced reflectivity coatings for a brighter picture
-- Secondary mirror: 70mm diameter (minor axis)
-- Field illumination: 25mm diam. (100%) / 38mm diam. (90%)
-- Weight: 8,7 kgs with tube rings and finder
-- Outer diameter: 230mm
-- Tube length: 730mm
-- 2" Crayford focuser with 1:10 dual speed transmission

Scope of delivery:
-- GSO 200mm f/4 Newtonian - Optical Tube Assembly with tube rings
-- 8x50 finder
-- 2" Crayford focuser with 1:10 dual speed transmission and reducer to 1.25"
-- 2" extension tube - to achieve focus with all kinds of eyepieces
-- Dust covers
-- 12V main mirror fan
-- Collimation manual

In our opinion, Newtonians by GSO are superior to other comparable systems:
We've been a GSO distributor for many years and we can confirm the exceptional quality of GSO telescopes. The optical performance is at a very high (and even!) level. In opposite to other manufacturers, we never see "lemons" from GSO. What is more, a GSO system can grow with your demands:

-- For the 8" GSO Newtonian, we offer a Carbon Tube Upgrade Kit
-- Short back-focus Baader Steel Track Focuser upgrade is possible without the need of new tube bores.
-- We offer secondary mirrors of different sizes according to your special demands (e.g. planetary imaging or deep-sky-imaging with full-size sensors)

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