-- high definition parabolical primary mirror, better than typical Chinese optics
-- thin secondary mirror spider vanes for minimized obstruction
-- larger illuminated field through use of a well-dimensioned secondary mirror. (Very important for astro-imaging and for observing with 2" eyepieces.)
--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

The GSN 2001 - A True All-Purpose Telescope

This telescope not only offers excellent optical performance, but also high quality mechanics, forming a truly all-purpose telescope with nothing to be desired.

Optical Quality

This GSO Newtonian of course has a parabolic primary mirror for optimum performance. GSO has a reputation for making some of the finest mirrors in this price range. We guarantee diffraction limited performance, but in our experience the GSO telescopes are even much better than that. One particular advantage is the very smooth mirror surface that results in practically no light scatter.

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.

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 2001 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.