Skywatcher 10 inch Dobsonian. With a 9mm I can see could bands. Reply The secondary mirror spider was constructed from steel. This was the only component on the scope that used this premium material, as it was deemed important to ensure dimensional stability in the mirror cell. [Credit: sherwoods-photo.com] 1) Building a Dobsonian Telescope At Home. When used in conjunction with the azimuth ring, this allows the scope to be accurately aimed in alt-az coordinates. This instructable documents the design and construction of a 10” reflector telescope. The white SkyWatcher Dobsonian 10-Inch telescope comes inclusive of a solid-rocker mount with Teflon bearings and a tension control handle. It is constructed from the same ¾” plywood as the rocker box. This was done because the plastic moisture-barrier on the interior of the tube is fairly smooth and slippery, and it seemed unlikely that latex paint would bond to it reliably. If I were to do the project over, the only things I would change would be routing out areas of the plywood base and rocker box to remove weight, as the finished scope is rather heavy, and positioning the altitude bearing farther forward on the tube to reduce the need for counterweights on the back end. First - disclaimer - I live in a very light-polluted area (Bortle 7 zone) so your results may be better if you're outside the city light. The low center-of-gravity and wide base make the scope very stable, and position the eyepiece low enough that children can look through it without need for a step-ladder. Because the rectangular vanes are welded to the center tube, they do not need to be held in tension to maintain their position, which makes mounting and positioning easier. 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. Easy to put up, take down, and collimate. The rocker box also includes a pair of accessory tie-down rings for affixing beanbag-style counterweights. The lower portion of the base incorporates a plastic ring that rides in a small channel routed into the base. Very nice design. This 10-inch Dobsonian telescope is specially designed to provide you with the most beautiful view. (I can't measure the secondary thickness exactly without pulling out the spider assembly...which sounds like a lot of work before breakfast.) Dobsonian telescopes have a very simple reflector design, which is why they are very easy to make at home. 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. As a disclaimer – this was my first build of a telescope, and I am not a professional optical designer, so I don’t purport to be an authority, but I have successfully seen the project through to completion and can report that it works! Sky-Watcher Classic 10” Dobsonian Telescope. What kind of images of Jupiter, Saturn, the Moon, etc do you get with a 10 in Dobson? The focuser itself is a 2” Crayford design. Share it with us! This is necessary to compensate for the variation in mass and balance when using different eyepieces; the altitude bearings are of sufficiently low friction that without the removeable counterweights a heavy eyepiece will tend to tip the scope down, while a small eyepiece will allow it to rise. A future upgrade will include wrapping the tube in white self-adhesive plastic drawer liner (“Con-tact Paper”) to provide a more robust moisture protection surface. The user-friendly mount makes the scope easy to handle, while its tension control adjuster enables you to tighten the optical tube in a desired position. This helps a lot. Reply The springs are located in shallow counter-bores to keep them concentric with the bolts and ensure that the cell is supported evenly. The secondary mirror is secured using clear RTV silicone, and includes a “safety leash” made from mason twine to prevent the secondary from falling onto the primary mirror in the event that the RTV silicone bond should fail. About: Engineer, designer, machinist, welder, guitarist, woodworker, amateur astronomer, and general analog hacker. 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. Very impressive, thank you for sharing! The ring can be rotated by sliding in its channel; this allows it to be “zeroed out” by first aiming the scope to a target with a known azimuth coordinate (such as Polaris) and then sliding the ring until the reference mark on the upper portion of the base aligns with the corresponding coordinate on the ring. I hope this helps! Did you make this project? Why Build a Dobsonian Telescope Yourself? This greatly reduces the cooling time of a telescope larger than 8” in diameter without using an extra fan. It is not intended to be a complete step-by-step instruction set, but rather to document some of the design details and methods that were used. Both mirrors were manufactured by GSO and can be purchased from Agena Astro Products. The telescope’s simplicity, coupled with serious light-gathering power, makes this one of the best 10 inch dobsonian telescopes available in the market today. The rocker box is constructed of ¾” plywood, and supports the primary mirror cell as well as the altitude bearings. Because of its very low coefficient of thermal expansion, Pyrex glass is less affected by changing temperatures. Call (866) 252-3811 They make little web-cam like things that will fit in the focuser to let you take pictures, but I don't own one, so (short of holding my cell phone up to the eyepiece) I don't have an easy way to provide images, let alone good ones that accurately represent the quality of what you see looking through the scope. Because of its very low coefficient of thermal expansion, Pyrex glass is less affected by changing temperatures. It features a primary parabolic mirror that is precisely placed to eliminate any spherical aberration in the images. There are a lot of online sources filled with good information on how to build a basic Dobsonian telescope. I hope my experiences in this project prove valuable to other builders! The upper (moving) portion is secured to the lower (stationary) portion with a simple elevator bolt through a bronze bushing and a loc-nut. This was done in lieu of screws for two reasons: first, to avoid the possibility of splitting the plywood rings, as screws would go into the edge-grain of the plywood; second, to avoid the necessity of having numerous exterior fasteners on the tube, which would detract from aesthetics and have a tendency to snag on clothing during transport of the tube. During construction, the rings were first positioned individually, then a series of eight ¼” holes were drilled through the cardboard of the tube until the wood surface of the ring was exposed. The tube itself is a concrete form tube, made from 0.095” thick cardboard. 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. 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. This design had a few additional requirements that made it slightly different than most “standard” Dobsonians; it was going to be used by children, so it needed to be durable, extremely stable, as well as low enough to the ground for kids to look through the eyepiece, ideally without need for a step-stool. The primary mirror cell was constructed from ½” Baltic birch plywood. 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. Both plates were cut using a hole-saw from galvanized steel electrical-box covers. Considering that this scope delivers a relatively large aperture, accurate positioning capability, along with great stability and usability, these seem like fairly small problems for a project that can be realistically executed for under $500. At the other end of the scope, a plywood accessory platform is clamped to the exterior of the tube with a pair of plywood rings. That being said, using a moderate eyepiece (15mm) I can discern four of Jupiter's moons easily. Hi - the main mirror is 250mm in diameter and about 35mm thick. This arrangement is designed to maximize rigidity and prevent vibration of the secondary mirror when the telescope is in use. The tube is reinforced with a series of plywood baffle rings on the interior, as well as a plywood focuser support and the secondary mirror holder. Just follow this DIY guide to building a Dobsonian telescope at home. The support lugs are lined with pool-table felt to ensure that they don’t scratch or bind on the edges of the mirror. 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