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Explore Scientific 20" (500mm) Truss Tube Dobsonian – Generation II

We introduce this High quality and functional 20" (500mm) Truss Tube Dobsonian – Generation II by Explore Scientific. Nowhere do you have as much light for your money as a good Dobson! Disassembly of the Explore 20" Dobsonian without tools assure a trouble-free transport of this great scope, even in small cars. All structure has been optimized for maximum stiffness with minimal weight. Bringing together high-altitude bearings with optimized aluminum structures grants fine adjustment flows at high magnifications.
The preferred and ideal workhorse for the deep sky observers. A 500mm mirror collects more than 5,100 times as much light as the naked eye. Even inexperienced observers will see details on planets and deep-sky objects. The Bright star clusters resolved to the core, and the sight of the terminator on the moon is a remarkable experience.
The fast 20" f/3.6 primary mirror and the large 120mm secondary mirror are made of high-quality quartz material, reducing the cooling time. This Dobsonian is quickly ready for use. Every primary mirror is delivered with an individual optical test certificate, which guarantees the highest capacity. A laser engraved center mark of the primary mirror allows easy adjustment. The optical surface has a high-quality aluminum silvering with 94% reflectivity and an extremely resistant quartz protection layer. The mirror overcomes dew fogging and cleanups without damage and guarantees a long service life.
A second 40° displaced installed mounting plate with a viewfinder shoe allows the rotation of the tube top for a favorable position of the viewfinder tube or the mounting of an additional TELRAD viewfinder. The six supporting feet underneath the rocker box offer perfect stability and guarantee smooth tracking in azimuth. Four smaller fans are installed on the side of the mirror box, and a large fan is installed under the primary mirror. This allows an even quicker adaptation to the ambient temperature and reduces the tube seeing (boundary layer removal). The lateral altitude wheels can now be stowed comfortably in the foam layers of the mirror box.

Includes 2.5" HEX focuser with helical gearing and 10:1 reduction; LED Red Dot Finder, collimation assist tool; soft light baffle, and two radial main mirror fans for fast temperature equilibrium.

The scope is ready for use with our optional coma corrector.

Explore Scientific 20" (500mm) Truss Tube Dobsonian Specs: