Dobsonian telescopes are the simplest variant of the Newtonian mirror system and unbeatable in terms of value for money. If you want to do some deep-sky observations without much effort and if you are looking for a large aperture for little money, you should look at these telescopes.
The new Skyliner 10" Goto Dobson with FlexTube design and parabolic primary mirror for sharp and contrasty images
Characteristics:
Aperture 254mm, focal lenght 1200mm, f/4.7
Central obstruction appr. 27%
2" focuser with reduction 1¼"
Resolving power: 0.59"
Retractable upper tube unit
Parabolic mirror and secondary mirror coated with Radiant Aluminum Quartz (RAQ) coating, with up to 94% reflectivity and optimum durability and long-term stability