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Explore Scientific Generation II 12-inch f/5 Truss Tube Dobsonian Telescope

SKU ES-DOB1245-01
Sold out
Original price $1,999.99 - Original price $2,085.98
Original price
$1,999.99 - $2,085.98
Current price $1,999.99
Out of stock
Out of stock

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Explore Scientific Generation II 12-inch f/5 Truss Tube Dobsonian Telescope - ES-DOB1245-01

Introducing the Explore Scientific Generation II 12-inch f/5 Truss Tube Dobsonian Telescope, an embodiment of cutting-edge telescope technology.

This Generation II iteration has undergone comprehensive updates to enhance its performance and functionality.

The Dobsonian telescope has profoundly revolutionized amateur astronomy, and this telescope continues that tradition.

Prior to John Dobson's innovative design, most amateur telescopes were characterized by small apertures and rudimentary mechanisms, limiting their ability to reveal celestial wonders beyond the polar caps of Mars or the rings of Saturn.

Larger telescopes, like the Schmidt-Cassegrain, were a luxury for the privileged few.

The Dobsonian telescope, with its ingeniously simple yet highly effective mechanisms and a wide aperture, has embarked on a triumphant journey around the globe.

It offers unparalleled value in terms of light-gathering capacity, making it a superior choice for astrophotographers and observers alike.

Assembly and disassembly of this telescope are effortless, requiring no tools, ensuring hassle-free transportation, even in compact vehicles.

Its structural design prioritizes maximum rigidity with minimal weight, facilitating precise adjustments, especially at high magnifications, courtesy of the combination of high-altitude bearings and optimized aluminum components.

This telescope serves as the ideal workhorse for deep-sky enthusiasts.

With its impressive 305mm mirror, it captures over 1,800 times the amount of light perceived by the naked eye.

This increased light-gathering capability reveals planetary details and deep-sky objects with remarkable clarity, even for novice astronomers.

Star clusters shine brilliantly, and the lunar terminator provides an unforgettable viewing experience.

Equipped with a 2-inch focuser featuring helical gearing and a 10:1 reduction ratio, an LED Red Dot Finder, a collimation assist tool, a soft light baffle, and two radial main mirror fans to achieve rapid temperature equilibrium, this telescope is designed to optimize your astronomical observations.

Please note that the AA Battery Pack for the fans is not included.

Moreover, this telescope is fully compatible with our optional coma corrector, opening up possibilities for refining your astronomical imagery and ensuring pinpoint star images across the entire field of view.



  • Impressive 12-inch Aperture: Featuring a generous 12-inch (305mm) primary mirror, this telescope excels at collecting light. It captures over 1,800 times more light than the naked eye, allowing you to explore planetary details and deep-sky objects with remarkable clarity
  • Focal Length of 1,525 mm: This telescope boasts an impressive focal length of 1,525 mm, granting it exceptional magnification power. This feature makes it well-suited for intricate examinations of planets, lunar characteristics, and detailed observations of celestial objects within our galaxy. Additionally, when paired with the appropriate equipment, it can deliver enhanced image clarity for astrophotography.

  • 600x Highest Useful Magnification: With a highest useful magnification of 600x, this Dobsonian telescope allows for remarkably close-up views of planets and lunar landscapes, revealing intricate structures and fine details. This level of magnification is invaluable for serious planetary enthusiasts seeking to delve deep into their observations.

  • Enhanced Generation II Design: This telescope is a Generation II model, meaning it has undergone thorough updates and improvements to ensure optimal performance and functionality. These enhancements make it a reliable and advanced instrument for stargazers.
  • Dobsonian Revolution: The Dobsonian telescope design has significantly transformed amateur astronomy. Before its introduction by John Dobson, most amateur telescopes were small, with basic mechanics, limiting their capabilities to observe celestial objects. This telescope continues the Dobsonian tradition of delivering extraordinary value and performance.
  • Ideal for Deep-Sky Observations: Designed to be the workhorse for deep-sky observers, this telescope reveals the intricacies of star clusters and provides a captivating view of the lunar terminator. Even those new to astronomy can appreciate the stunning celestial sights it offers.
  • User-Friendly Assembly and Disassembly: The telescope is engineered for convenience. It can be easily assembled and disassembled without the need for tools. This feature ensures trouble-free transportation, even in compact vehicles, making it accessible to astronomers on the go.
  • Sturdy Construction with Minimal Weight: The telescope's structure is optimized for maximum rigidity while keeping weight to a minimum. This design allows for precise adjustments, especially at high magnifications, ensuring stability during observations.
  • Advanced Optical Components: Equipped with a 2-inch focuser featuring helical gearing and a 10:1 reduction ratio, this telescope facilitates precise and smooth focusing, enabling you to achieve sharp, detailed views of celestial objects.
  • Included Accessories for Optimal Performance: The telescope comes with essential accessories, including an LED Red Dot Finder, a collimation assist tool, a soft light baffle, and two radial main mirror fans. These accessories enhance your observing experience and promote fast temperature equilibrium for optimal image quality. Please note that the AA Battery Pack for the fans is not included.
  • Coma Corrector Compatibility: For those seeking to further enhance their optical performance, this telescope is ready for use with an optional coma corrector. This accessory corrects optical aberrations and ensures pinpoint star images across the entire field of view, opening up new possibilities for astrophotography and observation.


                                                       Explore Scientific Gen II 12-inch Truss Tube DOB Unboxing & Assembly Video:


                                                      Recommended Accessories:

                                                      For a reliable and uninterrupted power source that eliminates the hassle of frequent battery replacements, ensuring uninterrupted viewing sessions, consider the optional Explore Scientific 12V Battery Power Supply for Dobsonians, designed specifically for Truss Tube Dobsonian Telescopes.


                                                      The BPS-12VDC-AA offers uninterrupted power, making it ideal for extended stargazing sessions and astrophotography, greatly enhancing your overall telescope experience.


                                                      What's Included:

                                                      ✓ Explore Scientific Generation II 12-inch f/5 Truss Tube Dobsonian Telescope

                                                      ✓ Led Red Dot Finder

                                                      ✓ Rockerbox

                                                      ✓ Collimation assist tool

                                                      ✓ 2" Hex Focuser

                                                      ✓ Soft light baffle and 2 radial main mirror fans

                                                      ✓ Screws and clutches

                                                      ✓ Limited 1 year warranty



                                                      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

                                                      Explore Scientific Gen II 12-inch Truss Tube Dobsonian Telescope Product Manual:

                                                      Customer Reviews

                                                      Based on 2 reviews
                                                      mike m.
                                                      Es12 dob

                                                      Arrived very well packaged
                                                      Missing a thumbscrew for the red do finder dovetail
                                                      And revived a d sized battery pack when I ordered AA sized one

                                                      Scope itself is awesome

                                                      Large Aperture at an affordable price

                                                      These types of Truss Tube Dobs offer very large apertures at affordable prices. It does come with lots of different parts/pieces - so you will need to stay organized. If you wish to step it up a notch from a traditional tube Dobs, then I definitely recommend the Truss Tube Series. Keep in mind, these scopes are typically meant for long periods of outdoor viewing. I may consider upgrading to the 16 or 20 inch Truss Dob at some point. Clear skies!