The GSO Dobsonian line is particular model serves a very clear purpose, to offer a large aperture and an excellent image quality at reasonable cost.
Set-up is as easy as you can imagine very simple assembly with the rocker box and put it on the ground, insert the telescope tube and put the springs in position and you're ready to go to navigates through the night sky by simply moving the tube up or down, or side to side, by hand.
All GSO dobsonian use optical quality BK7 glass, cooling fans built into the rear cell to decrease cooling times, also all dobs use a roller bearing on the azimuth surface providing dozens of support points for smooth swivel motion. The deluxe model comes with 2" Micro 10:1 Crayford style focuser and 1.25" adapter.
 
New design GSO truss tube 16" aperture, 1800mm focal length Dobsonian delivers amazing views of deep space and represents outstanding value! 
Huge 16" f/4.5 primary mirror boasts superior 1/12 wave surface error
New, stronger roller bearing design with thicker steel panels
Unique new roller side bearings with adjustable tension/braking by way of extra large, knurled side knobs!
Tube balance adjustment (fore and aft) of up to 25mm is possible
Strong 18-point primary mirror flotation cell - with a 4.7" cooling fan!
Easy assembly and disassembly of its heavy duty "TPL" truss tubes compared to complex 6-truss tube designs
Crayford style 2" 10:1 precision microfocuser with 1.25" adaptor
Oversized knurled collimation knobs allow easy mirror adjustment
Outstanding quality - overall! Black colour, not white!
No white reflective surfaces within the optical path in this design!
Features an achromatic 8 x 50 right-angle correct image finderscope
Limiting magnitude of 15.5 and resolving power of 0.29 arc seconds
You will see into deep space like you've never seen before...
Includes 2" 35mm eyepiece extension tube, 2" eyepiece accessory 
tray
 
Please Download INSTRUCTION MANUAL in PDF from the link provided below.
Physical Copies of the manual will not be given.
 
Telescope Specification:
16" Parabolic primary mirror
Focal length: 1800mm, F/4.5 
2 " Precision Micro 10:1 Crayford style focuser 
2 " 35mm Eyepieces Extension tube 
18 points mirror cell w/ 4.7" cooling fan. 
Roller bearing wood base 
All CNC made adjustment side bearing
 
Standard Accessories: 
8x 50mm fully multi-coated achromatic Finder 
Premium Plossl 9mm (1.25") 
Premium SuperView 30mm (2")   
Moon filter included 
2 " Eyepieces tray
 
What's in the box? 
16" (406mm) f/4.5 Newtonian optical tube assembly
9mm Plossl 1.25" eyepiece
30mm Premium SuperView 2" eyepiece
2" 10:1 Crayford focuser with adaptor for 1.25" eyepieces 
8x50 fully multi-coated achromatic finder 
Dobsonian base (assembly required)
Cooling Fan
 
Box Dimension:
GS 990 Tube UP............: 63 cm x 63 cm x 42 cm3. NW 8 kg/ GW 10 kg
GS 990 Tube Bottom.... : 64 cm x 64 cm x 76 cm3. NW 33 kg / GW 35 Kg
GS 990 BASE ................: 95 cm x 95 cm x 20 cm3. NW 30 kg / GW32 kg
8x50 Finderscope
Powerful 8x50 finderscope, multicoated objective lens. This little telescope will show many objects in direct vision for easy location.