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Explore Scientific 12" 305mm f/5 Truss Tube Dobsonian Telescope

SKU: ESDOB124500 MFR: DOB1245-00
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Key Features

  • Experience stunning views with the Explore Scientific 12" Dobsonian Telescope.
  • Enjoy bright, detailed images thanks to the large 305mm aperture size.
  • Achieve impressive magnification power with a focal length of 1525mm.
  • The stable Dobsonian mount ensures smooth tracking for celestial objects.
  • Easy to assemble and use, perfect for astronomy enthusiasts of all levels.
  • Portable truss tube design makes transporting your telescope a breeze.
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Special Order?Estimated to Ship: 08/16/2025
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Questions & Answers

Shopper : Is the mirror 12 or 12 1/2 inches in diameter?ANDREW R : Specifications Secondary Obstruction 24% Primary Mirror Diameter 305mm Focal Length 1525mm Focal Ratio f/5 Weight Total: 66.2lbs / 30.03kg Primary Mirror: 50.5lbs / 22.91kg Rocker Box: 15.7lbs / 7.12kg
roger s : how does it swivel horizontally?GLENN F : I've never owned this particular scope, but it should be like all other Dobs...the entire rocker box assembly sits on a "lazy susan" type of disk (that comes with the scope and attaches to it). It will have full-motion swivel, 360 degrees.
Shopper : Why Did You Choose This?RODNEY W : it look like a quality product

Reviews about this item

Review Summary

2018-12-31T05:26:13

Rated 5 out of 5

NICE TELESCOPE!!

No eyepieces came. I did not realize the range of their expense. Some of them contain 6 or 7 lenses and weigh as much as a pound or more. Some in an economy price range perform better than 90% as well as the best. There is a universe of eyepieces. You would be surprised at how well some of the least expensive ones compare to the higher priced. A Barlow lens will double the power of each eyepiece. In mine the lens element may be unscrewed from the Barlow lens housing and screwed into the eyepieces thus increasing the power maybe 25 or30 per cent giving you some varied and pleasing magnifications. A variable adjustment filter is a must for viewing the moon. The moon will nearly blind you using this scope. I collimate the scope without a collimation laser or tool. I position the telescope vertically and remove the eyepiece. This allows me to see the primary mirror through the secondary mirror. I hold my eye very near the hole and center the primary mirror in the secondary using the 3 adjustments. Next, I adjust the primary mirror using the wrench that came with the scope. I adjust until the reflection of my eye is centered in the small circular marker on the primary mirror. I slowly back away from the eyepiece viewing hole to a distance of about 6 or 7 feet. If the reflection of my eye and the primary center mark is perfectly centered, I know that the mirrors are in perfect alignment. Seeing stars as perfect points with uniform fading crosshair rays is good collimation. I notice that the scope is holding alignment better each time I move to my viewing location even with the minor bumps and agitations while rolling my homemade platform. I have a black rubber car mat with tiny black knobs that cushion against shock and prevent the scope from sliding while rolling across the lawn. One night the laser dot finder scope snagged on my back door as I was pulling the scope out into the yard. The rocker box pulled out of the primary mirror box toppling the scope to the ground. The only damage was the plastic piece that connects the finder scope to the circular bracket housing the secondary mirror. I located a piece of 1/4 inch thick high quality veneer wood and cut a piece 2 and 1/2 inches long with a 2 inch base to mount in the telescope bracket and a 1 inch top with a center notch that mounted perfectly into the finder scope. I painted this little piece of wood flat black and it functions as well or better than the original part. For kicks and a back up, I ordered another similar red dot laser finder scope from China for about $10. Hey, a country boy can survive and often even proudly rise. I can do a lot of minor, sometimes major fixes and have found that often a roll of duct tape (preferably high quality, professional) can get you through some usually temporary, sometimes permanent quick and essential fixes. As an astronomer never forget the sky is the limit, but as a adage all limits are made to be broken.Write your review here. It must be at least 10 characters long. Consider whether you would recommend this product and what you like or dislike about it.

MIKE R.

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Explore Scientific Dobsonian Telescope Specifications

  • Secondary Obstruction

    24%

  • Primary Mirror Diameter

    305mm

  • Focal Length

    1525mm

  • Focal Ratio

    f/5

  • Weight

    Total: 66.2lbs / 30.03kg
    Primary Mirror: 50.5lbs / 22.91kg
    Rocker Box: 15.7lbs / 7.12kg

  • UPC Code

    812257015573

About Explore Scientific Dobsonian Telescope

FEATURED REVIEWS

NICE TELESCOPE!!

By MIKE R.

No eyepieces came. I did not realize the range of their expense. Some of them contain 6 or 7 lenses and weigh as much as a pound or more. Some in an economy price range perform better than 90% as well as the best. There is a universe of eyepieces. You would be surprised at how well some of the least expensive ones compare to the higher priced. A Barlow lens will double the power of each eyepiece. In mine the lens element may be unscrewed from the Barlow lens housing and screwed into the ey...

View full Review

When it comes to revolutionizing the world of amateur astronomy, no telescope has made a greater impact than the Dobsonian. This 12" (305mm) f/5 Truss Tube Dobsonian Telescope, introduced by John Dobson, has transformed the way we explore the cosmos. Prior to its inception, most amateur telescopes were small and mechanically primitive, barely capable of capturing the polar caps of Mars or the rings of Saturn. Larger, more advanced telescopes like the Schmidt-Cassegrain were exclusive to the affluent.

This Dobsonian telescope, however, breaks these barriers with its ingenious blend of simple yet effective mechanisms and maximum aperture, offering an unparalleled viewing experience. Its unique design has led to its global popularity, offering the most light per dollar compared to any other telescope in the market.

Designed for maximum stiffness with minimal weight, this telescope is optimized for stability and precision. Its high altitude bearings coupled with optimized aluminum structures facilitate fine adjustment flows even at high magnifications, making it the perfect tool for deep sky observers.

The 305mm mirror of this Dobsonian telescope collects over 1,800 times more light than the naked eye, revealing details on planets and deep sky objects that are often missed by inexperienced observers. It brings bright star clusters into sharp focus, right down to their core, and offers an unforgettable view of the moon's terminator.

This telescope comes equipped with a 2" focuser featuring helical gearing and a 10:1 reduction, an LED Red Dot Finder, a collimation assist tool, a soft light baffle, and two radial main mirror fans for rapid temperature equilibrium. It's also compatible with Explore Scientific's optional coma corrector.

Whether you're an amateur stargazer or a seasoned astronomer, this 12" (305mm) f/5 Truss Tube Dobsonian Telescope offers a user-friendly, high-quality, and innovative solution for your celestial explorations.

Explore Scientific Dobsonian Telescope Features

  • 12" (305mm) f/5 Truss Tube Dobsonian Telescope for enhanced deep sky observation
  • Sturdy and lightweight design optimized for maximum stiffness and portability
  • High altitude bearings with aluminum structures for precise adjustments at high magnifications
  • 2" focuser with helical gearing and 10:1 fine reduction for sharp focusing
  • LED Red Dot Finder and collimation assist tool for easy targeting and alignment
  • Equipped with two radial main mirror fans to achieve thermal equilibrium quickly

Product Documents

User Manual

Key Features

  • Experience stunning views with the Explore Scientific 12" Dobsonian Telescope.
  • Enjoy bright, detailed images thanks to the large 305mm aperture size.
  • Achieve impressive magnification power with a focal length of 1525mm.
  • The stable Dobsonian mount ensures smooth tracking for celestial objects.
  • Easy to assemble and use, perfect for astronomy enthusiasts of all levels.
  • Portable truss tube design makes transporting your telescope a breeze.

What's in the box:

  • Explore Scientific 12 " 305mm f/5 Truss Tube Dobsonian Telescope
  • Explore Scientific 1 Year Limited Warranty
  • Explore Scientific Lifetime Unlimited Warranty (with Registration)