The drawings are only approximately to scale. I suspected that the company was either in trouble or no longer in business. I decided to keep this tube for now and if I run into problems with it, I can replace it later. It turned out that they had an incorrect zip code and the package was still waiting to be sent. I pointed it at distant trees and had no problem bringing the image into focus with all of my eyepieces. For this project, I didn’t have any plans so I had to spend a lot of time figuring out the appropriate dimensions of each elements. Check out these plans for 10 DIY telescopes you can build on the cheap and getting started with .your viewing fun this weekend. I got the blank and abrasives from here: http://firsthanddiscovery.com/8-inch-telescope-mirror-kit.html. Your astrophotographer friend may have included his own images from his setup. I first tried my 32mm plossl eyepiece. I recently completed the tube of my 8 inches telescope. How to build a 12.5 inch closed tube Dobsonian telescope. I didn't bother reading his whole article to figure out what f/# he used) I am not trying to say that good AP isn't possible with a sonotube scope, (the 'friend' may very well have pulled it out of the dob mount, added rings and a dovetail, and mounted it on his CGE-Pro or comparable) but in this case it is unlikely.". Good luck with your 8″ project. I was certain not to move the jig at all before cutting the second circle. I phoned in the order in the last week of February and was told that it would take about 4 weeks to deliver the mirror. A week after they said they would send the secondary and other parts, I called to ask if things had been sent. After the second call, I received a response that it would be ready at the end of the following week. Share it with us! I paid the 50% deposit and dreamed of DSOs. I had designed the tube box so that there would be an extra ¼ inch around the tube. A few months later I ordered some other things from Scopestuff, including strips of Ebony Star laminate for the side bearings, a ring of Ebony Star for the rocker bottom, a strip of teflon to cut pieces for the ground board and side bearings, and a new base for my Telrad finder. I sanded all parts of the telescope with 220 grit sandpaper followed by 400 grit, making a very smooth surface to apply the stain. A 6 in primary mirror does not have enough weight to make the dob stable. Before I wrapped the tube (and before I discovered the problem with the primary placement) I determined the balance point on the tube. While I was building the primary mirror, I used Mel Bartels‘s website a lot. I have several of the books on building a Dobsonian Telescope. Next step, before my first acquisition of any parts, is to get with any amateur astronomers in Central Florida, so, wish me luck! I then attached the Ebony Star ring using contact cement. My wife helped me by moving the mirror into and out of the tube around the marked spot while I stood at the eyepiece trying to bring some distant trees into focus. I got a different stain, tested it, and went back to work. Like i said these are not my photos and i cannot coment on exactly how he set it up as i was not there all i can say is i saw the mount he used when he picked up the telescope. We then spread contact cement over the remaining veneer and tube surface, waited for the glue to dry, and carefully rolled the tube over the veneer. The lumber yard also gave me a lower price than I expected. Un-real!!! #@$%^#@!!!!! A neet site: http://www.astropix.com/HTML/I_ASTROP/CAMERAS.HTM Cool instructable, Dude! After hand-planing the boards on the non-routed side, I started to glue them on the baffles on every other segment of the hexadecagon. On the cutting diagram, you can see that the side bearings were cut 26 inches long. . I used a steel ruler for support and made a dowel from 2 inches thick birch stock. the tube is cardboard as well, you can also get a quality mirror at telescope.com for much cheaper. An Altitude Azimuth mount would also require a field rotator.There's no way these were taken with an Orion GoTo Mount. Once I decided to build a scope myself I had to decide on the aperture of the scope. I tried all of my other eyepieces and found that I could bring the image into focus in the other eyepieces, but it was very near the bottom of the focuser travel. Amateur Astronomy Magazine Sky and Glass They use a simple plywood mirror cell, stating that for an 8 inch mirror this cell will be adequate. I have seen some VERY impressive photos similar to those, taken with Nikon D700 and D300 cameras, with the proper filters- and mounts- on a quality scope. (Technically, it should have been 62.5 for a 12.5 inch f/5, but when the mirror came it had a note on the back that the focal length was 61 inches.) I used one of the top scraps from the rocker sides to mark an angle of 70 degrees from the center of the arc to the curved cut in order to properly space 1 X 7/8 teflon pads on the arcs. My concern turned to alarm when my wife told me that Discovery had charged the balance due on all items to my account a few weeks earlier. The next step was the primary mirror cell. After another 3 weeks, I was concerned that I had not received the mirror. After the pieces were glued together, I used a belt sander to smooth out any rough edges, being careful to keep both rocker sides and both side bearings exactly the same. Just as it was about to come into focus, the focuser bottomed out. When the skies were dark enough for observing I found that the scope moves easily into position and holds that position well. I called to express my concern and was told that it had all been packaged a few weeks ago and that it should have been sent. This Instructable describe the planning, design, and par… The first light was on may 3rd as I aimed at Venus with the sun still shining. This was to allow the circle cutting jig to be attached to the board to cut the arcs from a center point of 25 inches above the ground. Using a compass I drew circles on the top and bottom of the ground board to mark the inside and outside of the teflon ring on the bottom of the rocker bottom. I wanted to wrap the tube in veneer because I had seen a homemade telescope on a website that used veneer and I liked the look. Homemade 12.5 Inch Dobsonian Telescope: How to build a 12.5 inch closed tube Dobsonian telescope. Using a compass, I drew lines for the inside and outside of the Ebony Star ring on the top and bottom of the rocker bottom. I told them I was on my way. A week after they said they would send the secondary and other parts, I called to ask if things had been sent. Deep space photos like these require HOURS of exposure for each one. Thank you for posting this. You really need a step ladder even for my 10" when pointed overhead. The telescope uses standard 1.25 inch eyepieces so you can upgrade to higher quality eyepieces anytime you want. All i did was supply the telescope as far as his camera equipment i dont know what he used i never saw it all i know is he had my scope for about a month while i was traveling and he gave me these photos. The 48 inch width of the veneer was close enough to the diameter of the tube that I used it as is. Before attaching the sides and front to the bottom with wood screws, I wanted to make sure those screws would not interfere with the Ebony Star ring that would be attached to the rocker bottom. At this point, the scope was pretty much finished. I also started to design the baffles using Inkscape. I did not own all of the tools that I needed for this project, particularly a table saw and router, so I did a lot of work while visiting my Dad. 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