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Explore Scientific  |  SKU: ES-DOB1245-01

Explore Scientific 12" f/5 Truss Tube Dobsonian Telescope

$1,999.99 $2,399.99

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Explore Scientific 12" f/5 Truss Tube Dobsonian Telescope


Want Next Level Deep Sky Views? Get the Explore Scientific 12" Truss Tube Dobsonian Telescope that will help you unlock detailed cosmic wonders without complex setup hassles.



  • High-Performance Optics: Equipped with a 305mm (12-inch) aperture mirror, the Explore Scientific - Generation II - 12-inch Truss Tube Dobsonian Telescope collects over 1,800 times more light than the naked eye, revealing stunning details of planets and deep sky objects.
  • Focal Ratio and Length: With an f/5 focal ratio and 1525mm focal length, this telescope offers the perfect balance for both visual observations and astrophotography, ensuring sharp, clear images.
  • Dual-Speed Helical Focuser: The 10:1 dual-speed helical focuser allows for precise focusing without backlash, enhancing your viewing and imaging experience.
  • Easy Transport and Setup: The truss tube design ensures easy disassembly without tools, making transport hassle-free, even in small vehicles. The optimized structure combines maximum stiffness with minimal weight.
  • Quick Collimation: Features easy-to-adjust collimation mechanisms for both primary and secondary mirrors, requiring no additional tools and allowing single-person operation.
  • Steady Platform: The robust rocker box offers a stable observational platform with very low vibration, ensuring steady views at high magnifications.
  • Mirror Cooling Fans: Dual radial primary mirror fans rapidly adjust the mirror's temperature, reducing distortion and providing optimal viewing conditions.

The Explore Scientific - Generation II - 12-inch Truss Tube Dobsonian Telescope is for you if...

  • You're an Astronomy Enthusiast: Whether you're a beginner or experienced stargazer, this telescope's high-performance optics and ease of use make it ideal for anyone passionate about exploring the night sky.
  • You Love Deep Sky Observations: If your goal is to observe galaxies, nebulae, and star clusters in stunning detail, this telescope's large aperture and focal ratio will meet your needs.
  • Astrophotography is Your Passion: The f/5 focal ratio and precise helical focuser make this telescope perfect for capturing high-quality images of celestial objects.
  • Portability Matters to You: If you need a telescope that's easy to transport to remote dark sky locations, the truss tube design and tool-free disassembly will simplify your travels.
  • You Value Ease of Use: This telescope is designed for user-friendly operation, with features like easy collimation and smooth adjustments, ensuring a hassle-free experience.
  • You're Looking for Value: If you want the best aperture per dollar, this telescope offers exceptional performance and features at a reasonable price.
  • You Appreciate Advanced Features: If you seek advanced functionalities like mirror cooling fans and optional coma corrector compatibility, this telescope has you covered.
  • You Enjoy Fine-Tuning: For those who like precise control, the dual-speed focuser and large, smooth bearings provide the ability to make fine adjustments effortlessly.


Unlock the secrets of the cosmos with the Explore Scientific - Generation II - 12-inch Truss Tube Dobsonian Telescope. With a substantial 305mm (12-inch) aperture mirror, this telescope captures over 1,800 times more light than the naked eye, providing breathtaking views of planets, nebulae, star clusters, and distant galaxies. The f/5 focal ratio and 1525mm focal length strike the perfect balance for both visual observations and astrophotography, ensuring sharp, detailed images every time.

Say goodbye to frustrating focusing experiences with the dual-speed helical focuser, offering 10:1 precision control without the backlash common in traditional rack-and-pinion designs. This means you can achieve the sharpest focus effortlessly, whether you're observing the intricate details of lunar craters or capturing stunning astrophotographs of deep sky objects. The telescope's innovative design includes easy-to-adjust collimation mechanisms for both the primary and secondary mirrors, allowing for quick and accurate alignment without additional tools, making it ideal for astronomers of all levels.

Portability is a breeze with the truss tube design, allowing for easy disassembly and transport, even in small vehicles. This means you can take your stargazing adventures to remote dark sky locations without hassle. Despite its lightweight construction, the telescope's structure is optimized for maximum stiffness, ensuring a steady observational platform with very low vibration, even at high magnifications.

Smooth and precise adjustments are guaranteed with the oversize altitude (16.5-inch) and azimuth (13-inch) bearings, providing seamless tracking of celestial objects. The robust rocker box offers a stable base, enhancing your viewing experience. Additionally, dual radial primary mirror fans quickly adjust the mirror's temperature to match the surrounding environment, reducing distortion and providing clear, crisp images.

For those passionate about deep sky observations and astrophotography, the Explore Scientific 12-inch Truss Tube Dobsonian Telescope is ready for use with an optional coma corrector. This feature ensures edge-to-edge sharpness in wide-field views, making it perfect for capturing the vast beauty of the universe. Whether you are an experienced astronomer or a beginner looking to dive deep into the wonders of the night sky, this telescope offers unmatched performance and value.


Discover the Wonders of the Night Sky

Unveil the secrets of the universe with this powerful telescope. Here are just a few of the incredible celestial objects you can observe in stunning detail:

  • Planets: View intricate details on Jupiter's bands, Saturn's rings, and the surface features of Mars.
  • Nebulae: Capture the glowing clouds of gas and dust in famous nebulae like the Orion Nebula and the Ring Nebula.
  • Star Clusters: Resolve individual stars in dense clusters such as the Pleiades and the Hercules Cluster.
  • Galaxies: Explore the spiral arms and central bulges of distant galaxies like the Andromeda Galaxy and the Whirlpool Galaxy.
  • The Moon: Observe the craters, mountains, and valleys of our nearest celestial neighbor with breathtaking clarity.
  • Double Stars: Split close binary star systems and enjoy their contrasting colors and brightness.
  • Deep Sky Objects: Discover faint and elusive targets like globular clusters, planetary nebulae, and supernova remnants.


Enhance Your Stargazing Experience with Included Premium Accessories

Unlock the full potential of your Explore Scientific 12-inch Truss Tube Dobsonian Telescope with these top-notch accessories that come with the package. Each accessory is designed to make your stargazing sessions more enjoyable and efficient.

  • Two-Speed 2" Rack & Pinion Focuser with 1.25" Adapter: Achieve precise focusing with the dual-speed mechanism, allowing for both coarse and fine adjustments. The included 1.25" adapter ensures compatibility with a wide range of eyepieces.
  • LED Red Dot Finder: Easily locate celestial objects with the LED red dot finder, which projects a clear, red dot onto the sky, making alignment quick and effortless.
  • Collimation Assist Tool: Keep your telescope perfectly aligned with the collimation assist tool, ensuring optimal performance and crisp, clear images every time.
  • Flexible Light Weight Light Baffle: Reduce stray light and enhance contrast with the flexible, lightweight light baffle, designed to improve your viewing experience in various observing conditions.
  • Two Primary Mirror Fans: Quickly adjust the temperature of the primary mirror with the dual radial fans, reducing thermal distortion for sharper images. The optional 12V battery power supply ensures you can power the fans anywhere.


Take Your Stargazing to the Next Level

Don’t settle for less when it comes to exploring the universe. The Explore Scientific 12-inch Truss Tube Dobsonian Telescope is designed to meet your highest expectations and deliver unforgettable astronomical experiences. Invest in a telescope that combines high-quality optics, ease of use, and portability to enhance your stargazing adventures. Join the community of satisfied astronomers who trust Explore Scientific for their celestial explorations.


Browse the Explore Scientific Truss Tube Dobsonian series: 10" | 16" | 20"

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Explore Scientific 12" f/5 Truss Tube Dobsonian Telescope | ES-DOB1245-01 | 811803034433

Explore Scientific 12" f/5 Truss Tube Dobsonian Telescope

$1,999.99 $2,399.99




305 mm | 12"

Focal Length

1525 mm

Focal Ratio


Field of View



0.38 arc sec theoretical limiting stellar magnitude

0.45 arc sec theoretical Rayleigh limit

15.11 mag theoretical limiting magnitude

Barrel Size



34.6" (88cm) truss pole length

.79" (20mm) truss pole diameter

15" (38cm) secondary cage assembly diameter

6.7" (17cm) secondary cage assembly height

16.7" (42.5cm) mirror box/rocker box height42.5 cm

56" (142.24cm) height to center of eyepiece at zenith


Cage Assembly: 6.5 lb , Mirror Box: 50 lb
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