Explore Scientific 12-Inch f/5 Truss-Tube Dobsonian Telescope — Portable Large-Aperture Telescope for Deep-Sky Visual Astronomy

The Explore Scientific 12-inch f/5 truss-tube Dobsonian is a large-aperture telescope built for one thing above all: gathering as much light as possible so you can see faint deep-sky objects. A Dobsonian pairs a big Newtonian mirror with a simple, stable rocker base that you nudge by hand — the most light-per-dollar way into serious visual astronomy. Its 305mm (12-inch) mirror and 1525mm focal length (f/5) reach galaxies, nebulae and clusters that smaller scopes simply can't show.

The truss-tube design is the clever part: the tube breaks down into a compact mirror box and an open framework of poles, so this big scope disassembles without tools for transport and reassembles quickly under the stars.

Who it's for: Serious visual observers who want maximum aperture for deep-sky viewing in a transportable package. New to this design? Read our guide to Dobsonian telescopes explained.

• Huge 305mm mirror: a 12-inch aperture that reveals faint galaxies, nebulae and clusters.
• Truss-tube portability: breaks down tool-free into a mirror box and poles for transport.
• Fast f/5 optics: 1525mm focal length gives bright, detailed deep-sky views.
• 2" dual-speed focuser: two-speed 10:1 helical focuser for precise focus.
• Simple Dobsonian base: smooth, intuitive hand movement with no electronics required.

What you'll see: With 12 inches of aperture, the sky opens up: spiral structure in brighter galaxies, detailed nebulae like Orion and the Lagoon, globular clusters resolved into thousands of stars, and crisp, high-resolution views of the Moon and planets on steady nights. From a dark site it's a deep-sky powerhouse.

Why choose a Dobsonian?
Dobsonians give you the most aperture for your money, and aperture is what lets you see faint deep-sky detail — all on a simple, stable base you move by hand.

Is the truss tube hard to set up?
No — it assembles tool-free in minutes, and breaking it into a mirror box and poles makes a 12-inch scope far easier to transport.

Does it need collimation?
Yes — like all Newtonian reflectors, the mirrors need occasional collimation (alignment) to stay sharp; it's a routine, quick task.

Is it good for astrophotography?
It's optimised for visual observing; its manual alt-azimuth base isn't suited to long-exposure deep-sky imaging.