Generation II 12-inch Truss Tube Dobsonian Telescope

Sale price$ 1,999.99
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Product options: 12" f/5

The Generation II 12-inch Truss Tube Dobsonian Telescope brings powerful deep sky observing within reach, featuring a large 305mm (12-inch) primary mirror that gathers over 1,800 times more light than the naked eye. Perfect for beginners and experienced astronomers alike, this telescope reveals stunning planetary details, vibrant star clusters, and breathtaking views of nebulae and galaxies. Its innovative truss tube design allows easy disassembly without tools for compact transport and quick setup—even fitting in small cars. The optimized aluminum structure combined with high-altitude bearings ensures exceptional stiffness and smooth, precise motion for high-magnification viewing. Equipped with a 2" focuser featuring helical gearing and a 10:1 reduction for fine focusing control, an LED Red Dot Finder, and a collimation assist tool, this Dobsonian is built for high-performance visual astronomy. Dual radial fans speed mirror cooling to achieve thermal equilibrium quickly, enhancing image clarity. (AA battery pack for fans sold separately.) Optional coma correctors are available to enhance astrophotography capabilities.

SKU: ES-DOB1245-01

Standout Features

Powerful 12-inch Aperture

305mm mirror gathers 1,800+ times more light than the naked eye for stunning celestial views.

Tool-Free Disassembly & Transport

Truss tube design allows quick, easy breakdown for transport in small vehicles.

Smooth, Precise Focusing

2" helical focuser with 10:1 fine focus and optimized altitude bearings for fluid motion.

Fast Cooling System

Dual radial mirror fans promote quick thermal equilibrium to improve image sharpness.

Product Specifications

Item Number: DOB1245–01
f/ratio: f/5
Focal length: 1,525 mm
Primary mirror diameter: 35 cm
Secondary obstruction: 24%
Mirror cell support points: 9
Truss pole length: 88 cm
Truss pole diameter: 20 mm
Secondary cage assembly diameter: 38 cm OD
Secondary cage assembly weight: 6.5 pounds
Secondary cage assembly height: 17 cm
Mirror box/rocker box height: 42.5 cm
Mirror box weight: *50 pounds
Height to center of eyepiece at zenith: 142.24 cm
Theoretical limiting stellar magnitude: 0.38 arc sec
Theoretical Rayleigh limit: 0.45 arc sec
Theoretical limiting magnitude: 15.11 mag
Theoretical maximum magnification: 600x
*Mirror weight can vary because of the manufacturing process; these values are approximate