Explore Scientific 20″ f/3.6 Truss-Tube Dobsonian Telescope (DOB2036-00)

The Explore Scientific 20″ f/3.6 Truss-Tube Dobsonian is your gateway to truly deep-sky observing — a telescope designed to unlock nebulae, galaxies, star clusters, and faint celestial wonders that are beyond the reach of smaller scopes. With a massive 500 mm primary mirror, this Dobsonian collects over 5,100× more light than the naked eye, allowing you to explore deep-sky objects with phenomenal brightness and detail.

Its robust TIG-welded truss tube structure balances lightweight portability with rock-solid rigidity — ensuring smooth, vibration-free motion even at high magnifications. The open-tube design shortens cooldown time, while an integrated fan system helps the optics adapt quickly to ambient temperature for crisp, stable views.

Equipped with a 2.5″ dual-speed HEX focuser, a red-dot LED finder, collimation assist tool, soft-light baffle, and dual radial main-mirror fans, this telescope arrives ready to use. The sturdy Dobsonian rocker mount offers smooth alt-az motion and stable tracking, making it ideal whether you’re scanning the Milky Way or studying faint galaxies.

For avid observers looking for aperture, power and simple manual control — the 20″ Dobsonian is a “one-scope-fits-all” deep-sky champion.

Key Features

• Massive 500 mm primary mirror for deep-sky clarity and light-gathering power

• Fast f/3.6 focal ratio — bright, wide-field views that bring nebulae and galaxies to life

• TIG-welded truss-tube construction — strong, vibration-resistant yet transportable build

• Integrated fan system + open tube design for fast thermal equilibrium and reduced tube-seeing

• 2.5″ dual-speed HEX focuser — stable, precise focusing even with heavy accessories

• Red-dot finder, collimation tool, light baffle, and mirror fans included — ready to observe out of the box

• Large rocker base with smooth bearings — stable alt-az motion and balance for manual tracking

Specifications