With a 9mm I can see could bands. I would share pictures if I had some...but I don't have a ready means of getting images. One future improvement for the design will be the addition of a vernier scale instead of a single tick-mark reference on the moving portion of the base. Saturn looks awesome - the rings, shadow of the planet on the rings, and some striation are visible. The exterior of rocker box was similarly painted with semi-gloss black latex paint, and provides a nice contrast to the white tube, while the interiors was painted with flat black to reduce the possibility of internal reflections. Hi - I used a GSO mirror (10" f/5) along with a GSO secondary (62.5mm), both purchased from Agena Astro. Explore Scientific's 10-inch Truss Tube Dobsonian. The tube was primed and then painted with ordinary latex semi-gloss white paint, to ensure that it would be easily visible in the dark, and to provide a layer of protection for the cardboard should it be exposed to moisture. The lower portion of the base has three rubber feet constructed from hockey pucks, secured to the plywood base with wood screws and washers in counter-bored holes in the pucks; these serve to provide three-point support to the base which prevents wobbling, and also isolate the plywood base from the ground to avoid exposure to dirt and moisture. 1 year ago. In application, the secondary mirror has only needed to be adjusted once during initial setup and has not moved or required re-adjustment since then. The interior of the tube was painted with matte black paint, after first being scuff-sanded and then primed with a layer of shellac. These pads were surrounded with a ring of clear RTV silicone, and the mirror was then set on the supports while the RTV cured. This ring was cut from the same FRP panel as the bearings, and includes angular markings in single-degree increments. Find a Dobsonian Telescope for Sale Online at High Point Scientific . Rotational adjustment is facilitated by a small flat machined into the end of the threaded rod, which allows it to be gripped securely with a small wrench; loosening the top nut slightly allows it to be rotated and held in the desired position while the nut is re-tightened. The upper (moving) portion is secured to the lower (stationary) portion with a simple elevator bolt through a bronze bushing and a loc-nut. The elliptical secondary mirror is 62.5mm across it's minor diameter and is probably about 12mm thick. The attached drawings should give all necessary detail. Very impressive, thank you for sharing! All parts for the primary mirror cell were cut on a CNC router for expediency, but could be readily duplicated using non-CNC equipment if needed. Dobsonian telescopes have a very simple reflector design, which is why they are very easy to make at home. The baffles inside the tube are simple plywood rings, secured to the tube with “plugs” of epoxy. This design allows for the tube to be rotated to re-orient the position of the focuser if desired, and also allows for fine-tuning of the position of the focuser relative to the mirror. Sorry! The base supports the rocker box and enables the telescope to pivot, as well as providing a mechanism for positioning the scope accurately with respect to azimuth. When used in conjunction with the azimuth ring, this allows the scope to be accurately aimed in alt-az coordinates. The only downside to this construction method is that the rings are permanently bonded to the tube and cannot be removed or serviced, but this was considered an acceptable tradeoff, as it seems unlikely that this a need for removal would arise. It is equipped with a hinged rear panel (the “tailgate”) that allows installation of the mirror cell, as well as access to the mirror when needed. Hi - the main mirror is 250mm in diameter and about 35mm thick. Both mirrors were manufactured by GSO and can be purchased from Agena Astro Products. Why Build a Dobsonian Telescope Yourself? This instructable documents the design and construction of a 10” reflector telescope. Based in Detroit, Michigan. Question Because the tube assembly is fairly large and also heavy, a pair of steel anchor loops and a nylon should straps are affixed as well, which in practice make moving the tube assembly significantly easier. Adjustment of mirror position along the length of the tube is done by adjusting the position of this pair of loc-nuts. The rectangular vanes are affixed to a plywood support ring that fits into the optical tube. Explore galaxies and nebulae in minutes. The secondary mirror spider was constructed from steel. The Orion SkyQuest XT10 Classic Dobsonian is a big 10" aperture reflector telescope with a small price tag; Gobbles up light for great views of deep-sky objects such as nebulas, galaxies, star clusters, and close-up views of more nearby targets like the Moon and planets When cured, the epoxy was sanded flush with the surrounding tube, producing a strong, vibration-resistant joint. This provides a very rigid support for the mirror and prevents vibration when the scope is in use, prevents the possibility of the spider deforming the tube when the attaching fasteners are tightened, and ensures that the secondary mirror is reliably located in the center of the tube. You can do astrophotography of "bright stuff" - planets and moon - with a Dob, but the really cool stuff requires tracking and long exposures. They both arrived very well packaged and I was pleased with the transaction. The tailgate includes a support made from parachute cord to limit the opening of the tailgate and prevent it from “falling open” against a hard stop. Thank you very much. That being said, using a moderate eyepiece (15mm) I can discern four of Jupiter's moons easily. I've been considering making my own telescope at some point, so this was very nice to see : ). The four rectangular vanes are welded to a central segment of tubing, into which an aluminum reducer bushing is press-fit. This will make accurate azimuth positioning down to 0.1° possible without need for electronics or other aids. 10-inch Dobsonian Telescope: This instructable documents the design and construction of a 10” reflector telescope. A small section of PVC drain pipe, cut at a 45° bevel, is bonded to the lower plate using JB-weld epoxy. Easy to put up, take down, and collimate. The mirror cell tends to hold collimation very well, and the optical performance of the entire assembly is surprisingly good. The Sky-Watcher 10” Dobsonian features a primary mirror made of Pyrex glass. Just follow this DIY guide to building a Dobsonian telescope at home. The tailgate supporting the primary mirror cell is held in the closed position with a pair of rubber latches, typically seen on picnic coolers. I hope my experiences in this project prove valuable to other builders! Because the ring is fairly large (approximately 24” in diameter), the space between single-degree increments is fairly large (around ¼”), making it is relatively easy to aim the scope in the azimuth direction accurately. The rocker box also includes a pair of accessory tie-down rings for affixing beanbag-style counterweights. Both plates were cut using a hole-saw from galvanized steel electrical-box covers. The optical tube assembly is comprised of two major components, the rocker box and the tube. Also, it comes with a secondary mirror that minimizes light loss and diffraction spikes. The tube has a total of +/- 45mm adjustment from a nominal design position, which was intended to be enough to cover any errors in calculating the nominal position of the focuser. Meade 10" LightBridge Plus Dobsonian Telescope; Apertura AD12 12" Dobsonian Telescope; Skywatcher 12" Flextube Dobsonian Telescope; Skywatcher 16" Flextube SynScan GoTo Dobsonian Telescope; For more on these, check out our guide to the best Dobsonian telescopes for stargazing. Second, it makes installation of the focuser easier, as the captive T-nuts allow for all installation to be done from the outside of the tube – there is no need to reach into the tube to hold a nut and washer while driving the screws that secure the focuser. I hope this helps! 2 months ago. Sky-Watcher Classic 10” Dobsonian Telescope. About: Engineer, designer, machinist, welder, guitarist, woodworker, amateur astronomer, and general analog hacker. 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