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Explore Scientific Ultra Light Dobsonian 305mm

Product 1 of 27
Explore Scientific

Explore Scientific Ultra Light Dobsonian 305mm

Item #: 0116930
Modern 305mm truss-dobsonian telescope in full aluminium construction
  • Modern secondary mechanics - the collimation is easily achieved without tools and keeps collimation well during transports
  • Modern primary mirror cell - the telescope mirror can be collimated from the front while looking through the eyepiece and is supported by a modern floatation system with radial roller bearings
  • Large altitude wheels provide smooth and precise movement even at high magnifications
  • Secondary unit and altitude wheels fit into the rocker box and the mirror box includes a cover for transport so that the whole telescope breaks down into only two aluminium cases and the trusses
  • Extremely high rigidity construction
  • Dew-resistant because of aluminium construction: no deforming press board due to the exclusive use of metals
  • Lightweight: the aluminium profile/aluminium plate construction reduces the weight to about half of the mass of most press board designs of this price range
  • Two large radial fans for fast thermal equilibrium
  • Scope of delivery: Telescope, Manual, Reducer 2"/1.25", Red dot finder, Stray light shield for secondary cage, Main mirror collimation tool, Battery compartment with bag for fans, Extension tube for focuser
This item is not on stock and has to be re-ordered.
999,00 € *
Material OTA
Optical design
Newtonian Reflector
Focus Group
Visual enthusiasts
Advanced Amateurs
Batteries included
Maximum recommended magnification
ED glass
Field of application
Deep Sky Observation
Lunar observation
Planetary observation
Tripod height adjustable
Net Weight total (incl. accessories) (kg)
Primary mirror diameter (mm)
Secondary mirror diameter (mm)
Objective diameter (mm)
Focal length (mm)
Aperture ratio
Obstruction (%)
Angular resolution (arc seconds)
very good
Focusing system
2" Rack-and-Pinion Focuser with helical gearing and 10:1 reduction
Eyepiece Barrel Diameter (mm)
DeLuxe Red Dot Finder
Dust protection caps
Dust protection caps for open aperture and eyepiece holder
Mount Type
Ext. warranty after online registration (Years)
No telescope type has influenced amateur astronomy as radically as the dobsonian telescope. Before the introduction of this telescope type by John Dobson the vast majority of amateur telescopes were small inadequate refractors on shaky mounts - just good enough to show the polar regions on mars or the rings of Saturn. Bigger telescopes, like the Schmidt-Cassegrain telescopes, were restricted to the relatively small group of amateurs that could afford them.The brilliant combination of simple - but effective - mechanics and the largest aperture available led to a worldwide triumph of this concept. No other telescope type offers you so much light for your money as a good dobson. We have taken the motto "held together by gravity and driven by yoghurt power" and offer a modern version of the classic - designed by amateur astronomers for amateur astronomers. Despite its large aperture the telescope can be transported easily even in small cars and is assembled within minutes without tools. The construction was optimized for maximum rigidity with a minimum of mass. The combination of big altitude wheels and a optimized aluminium-sandwich construction allows for small movements even at high magnifications. The focus position is already positioned to accept our coma-corrector. The ideal workhorse for the deep-sky enthusiast. A telescope with 305mm aperture gathers more than 1800-times more light than the naked eye. Details on planetary surfaces stand out even to unexperienced observers, and countless deep-sky objects show details. Bright globular clusters are resolved down to the core and the view of the lunar terminator will provide a unforgettable experience.

Dimensions for mobile use: Rockerbox 450mmx450mmx320mm; Mirrorbox 380mmx380mmx300mm; Trusses approx. 980mm
Eyepiece Height while pointing at zenith approximately 1,4m.
12“ Net total weight: 32,1 kg; 12“ Mirror Box: 18,9 kg; 12“ Secondary cage +Rockerbox: 10 kg; 12“ 4 Pairs of trusses: 1,8kg; 12“ Altitude Wheels: 1,4kg

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06.11.2016 Slim writes:
So the excitement was building up upon the arrival of the new DOB

Assembly was not too hard, I noticed that the secondary mirror cage has a ratting noise which I am not sure where it's coming from!!!

I guess this shouldn't be an issue.

Once all assembled the motion was smooth in the altitude with a slight resistance in the Az.

First light has arrived and it was time to put the optics to the test.

First was aligning the scope finder which flimsy and horrible and made my night turn to a total waist of time.

The viewfinder was cheap and no fit for purpose. The projection glass was so dimm that you cannot see the stars!!!

Moving to the collimating which was seamless and straightforward.

For anyone coming from an EQ I was really surprised to see that the scope was very low due to the positioning of the focuser which made observing very awkward at all levels!!!

For the targets that I have observed I was very satisfied with the quality of the optics. Stars were pinpoint, Orion Nebula and running man showed wealth of details using Exploere UHC filter, M35 M38 were also a rush of stars just beautiful.

I guess I neee to tweak this telescope and definitely buy a new scopefinder to actually be able to stargaze.
05.10.2015 Kristijan writes:
I have tested the Scope several times. It's MAGNIFICENT, far better than I expected. Great contrast and light gathering power for nebulae. In my experience is by far better than Meade Lightbridge 16", I'm not kidding. Now I wonder what was wrong with that 16" mirror. So my experience up until now with dobsonians was only with that 16" Meade. And I can only compare my new scope only with that one.

As far as nebulae I have for first time seen them in such clarity and contrast with no filters at all. And when you apply some UHC and OIII filters than you get some great contrast and sometimes additional detail that were not visible with the Meade. About stars and double stars I had some difficulties to collimate it properly because there was no center marker on the primary mirror, but when I inserted center marker with sharpie (permanent marker) than I had no problem collimating and resolving Double-double in Lyrae. And all those ruby red carbon stars and red supergiant stars are blood red, like cars tail lights.

As far as planets goes, on Saturn you can easily see the Cassini division (6mm e-p), on Jupiter you can see the GRS (10 mm e-p), but on Venus I had annoying diffraction cross from the spider, something that I never saw on Lightbridge 16" when observing Venus. So I might say that when observing bright stars and Venus the diffraction cross was noticeable. And with Venus I had a lot of internal reflections because of bad e-ps. I still haven’t opportunity to observe Mars. Uranus and Neptune are pale blue dots.

For observing the Moon it was magnificent no matter what kind of eyepieces or magnification I was using. And I have used a double polarized filter to dim its brightness, which I recommend for the Moon and gas giants.

I have only regular eyepieces, nothing fancy with wide viewing angles, no naglers. This means as soon as I can I’ll purchase some nice eyepiece with 100° fov or more, I will. Those e-ps are usually half the price of the scope.

And again, back to nebulae. All of the planetaries are great: Ring; Dumbbell; Eskimo; Cat’s eye; Helix (OIII); even the one in M46 was great. And NGC 6572 in Ophiuchus which is visible in turquoise-greenish tint, my scope never loses that color even at x250, and with the Meade it starts losing color even at x140 magnification.

All the diffuse molecular clouds are magnificent: Orion; Lagoon; Eagle; Omega there are some nice new ones that I never observed like Pac-man which is nice with OIII.

All of the galaxies are great: Bode (M81-82), Whirlpool, Needle, Black-eye, Leo triplet, Sculptor, not to mention Andromeda with M32 and M110 in same fov with 40 mm e-p.

Open star clusters were great on 40mm eyepiece. I just think that globular clusters were on par with the Lightbridge 16", I don't know why maybe bad eyepieces.

M1 was great with UHC, Rosette is great with OIII and 40mm e-p, I had difficulties for the Veil but I think it’s the OIII filter because it is photographic version and that’s why is a lot dimmer compared to the Meade, the same problem for Crescent nebula.

The red dot finder is stupid, I use it on its maximum position so it’s very difficult to make fine adjustments. But maybe I'll fix a green laser on the scope, or even buy a new red dot or a telrad. Green laser is not welcome at star parties :)
This scope is very portable and very compact for transport, very, very quick for assembling. You can put it together all by yourself, which is not the case with the great Meade. And what is the most unusual it almost does not loose collimation, or maybe you need only minor corrections. The same is with the red dot, very rarely you need readjustment. You just assemble it in 5~6 minutes and shoot at the stars!

I’m really amazed by this scope, far better than I expected. When I got it, it had some loose screws here and there, but nothing serious. The stray light cover is attached with four velcro pads which are not well sticked to the cover, so some times they come off.

At first I taught it will be temporary until I save more money for the ES 16". But now I don’t think I’ll be buying a new one, this one is GREAT and compact. I love it!
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