I've been considering making my own telescope at some point, so this was very nice to see : ). This arrangement is designed to maximize rigidity and prevent vibration of the secondary mirror when the telescope is in use. Easy to put up, take down, and collimate. 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. 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. 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. 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. There are a lot of online sources filled with good information on how to build a basic Dobsonian telescope. The mirror cell tends to hold collimation very well, and the optical performance of the entire assembly is surprisingly good. Very nice design. The lower portion of the base incorporates a plastic ring that rides in a small channel routed into the base. The support lugs are lined with pool-table felt to ensure that they don’t scratch or bind on the edges of the mirror. I hope my experiences in this project prove valuable to other builders! Very impressive, thank you for sharing! 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. Why Build a Dobsonian Telescope Yourself? The rocker box is constructed of ¾” plywood, and supports the primary mirror cell as well as the altitude bearings. Overall, the scope works well. I cut my pieces on my home-brewed CNC router, but you could use these drawings as fullsize templates and cut the pieces manually using a jigsaw or bandsaw and a sander. It is constructed from the same ¾” plywood as the rocker box. This platform supports a Telrad reflex sight for aiming the scope visually, as well as a manual inclinometer which indicates the altitude orientation of the scope directly. Saturn looks awesome - the rings, shadow of the planet on the rings, and some striation are visible. 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. The four rectangular vanes are welded to a central segment of tubing, into which an aluminum reducer bushing is press-fit. These pads were surrounded with a ring of clear RTV silicone, and the mirror was then set on the supports while the RTV cured. Find a Dobsonian Telescope for Sale Online at High Point Scientific . This enables the scope to be placed on the ground arbitrarily (i.e. 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. Because of its very low coefficient of thermal expansion, Pyrex glass is less affected by changing temperatures. 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. The white SkyWatcher Dobsonian 10-Inch telescope comes inclusive of a solid-rocker mount with Teflon bearings and a tension control handle. 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. 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 I hope this helps! My shortest eyepiece is 5mm, but this level of magnification (250x) requires very still air and very good atmospheric transparency; on most nights I end up not going past the 9mm. 2 months ago. Also, it comes with a secondary mirror that minimizes light loss and diffraction spikes. A small amount of epoxy resin was then applied to the hole, bonding to both the ring and the tube. (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. You can do astrophotography of "bright stuff" - planets and moon - with a Dob, but the really cool stuff requires tracking and long exposures. 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. This has two purposes: first, it provides additional structural support to the focuser, so that in use if the focuser is bumped, grabbed, or otherwise abused, it is unlikely to damage the cardboard tube itself. The attached drawings should give all necessary detail. I would share pictures if I had some...but I don't have a ready means of getting images. 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. Sorry! I can see DSO's down to about magnitude 8.8 on most nights.