• Explore Scientific 20-Inch f/3.6 Truss-Tube Dobsonian — Flagship Large-Aperture Telescope for Deep-Sky Observers
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Explore Scientific

Explore Scientific 20-Inch f/3.6 Truss-Tube Dobsonian — Flagship Large-Aperture Telescope for Expert Deep-Sky Visual Observers

Explore Scientific 20-Inch f/3.6 Truss-Tube Dobsonian — Flagship Large-Aperture Telescope for Expert Deep-Sky Visual Observers

$9,999.99
$9,999.99
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The Explore Scientific 20-inch f/3.6 truss-tube Dobsonian is a flagship large-aperture telescope for expert deep-sky visual observers. A Dobsonian is a Newtonian reflector on a stable, hand-guided base, and at 20 inches this Generation II truss instrument gathers an immense amount of light — revealing detail in faint galaxies and nebulae that smaller scopes simply can't show.

Its 508mm (20-inch) mirror is a serious light bucket, and the fast 1826mm focal length (f/3.6) keeps the tube manageable while delivering bright, wide views of the deep sky.

Who it's for

Built for experienced observers and serious deep-sky enthusiasts who want maximum aperture for the faintest targets. New to the hobby? See our guide on how to pick your first telescope.

Key features

  • 20-inch (508mm) aperture for extraordinary light-gathering on faint objects.
  • Fast f/3.6 optics (1826mm focal length) for bright, wide deep-sky views.
  • Generation II truss design that breaks down for transport and tool-free setup.
  • Stable Dobsonian base engineered for a large instrument.
  • Flagship performance for the most demanding visual observers.

What you'll see

With 20 inches of aperture, faint galaxies reveal spiral structure and dust lanes, globular clusters blaze with resolved stars, and planetary nebulae show intricate detail. Bright planets and the Moon deliver stunning high-power views on steady nights. Under dark skies, this scope reaches objects far beyond the range of smaller telescopes.

Specifications
Brand Explore Scientific
Model DOB2036-00 (Generation II)
Optical design Newtonian reflector (truss Dobsonian)
Aperture 508 mm (20 inch)
Focal length / ratio 1826 mm, f/3.6
Base Dobsonian rocker base

Frequently asked questions

Who is a 20-inch Dobsonian for?
Experienced observers chasing the faintest galaxies and nebulae. It's a flagship visual instrument delivering views far beyond smaller scopes.

Is it transportable?
The Generation II truss design breaks down into components, though a 20-inch is a substantial instrument that requires space and planning to move.

Does it need collimation?
Yes. Like all large reflectors, it should be collimated (optically aligned) for the sharpest views, especially at its fast focal ratio.

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Frequently Asked Questions

With a beginner telescope you can see a surprising amount — the craters and mountains on the Moon, the rings of Saturn, the moons of Jupiter, and star clusters like the Pleiades. As you get more comfortable, you can also spot nebulae and distant galaxies. Not sure which beginner telescope is right for you? Check out our Telescope Buying Guide.
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All telescopes on Telescope Wolves are hand-picked with beginners in mind. If you're unsure which telescope is right for you, check out our Telescope Buying Guide.
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