Hello everybody, The 1100 mm telescope project we commenced in 2007 is taking a second start after nearly 4 years of interruption. See the web page for the...
The Cruxis Mirror Edge Support Calculator shows that two-point mirror edge support performs nearly as well as a 180 degree cable sling, with similar degrees of...
Hey everyone. I have acquired some PTFE strips 1/8" thick x 1" wide x 9 ft long. I can cut these into any length you desire. And if you need 3/4" wide, I...
BigDob group, this spring a 28" f4.1 Starmaster w/Kennedy optics has been installed in a new astro village 30mi south of Silver City, New Mexico. Last night...
Hi, I'm tring to decide on a suprax mirror blank thickness for a 600mm - the maximum size of their moulded blanks, the choice is 45mm or 60mm? I have made two...
For several years I have had a 16 x 1 inch mirror with a fan on the back and small 1 inch fans that blow across the font and so had not noticed the following...
Have a Coulter 13.1 Odessy 1 scope. spoke to a couple of recoaters about the primary mirror and both find that they have recoated many. Has anyone had their...
Has anyone got any photos/links to a large dobsonian mounted classical cassegrain? I have a chance at getting a heavy (125 lb ) OTA and am musing about...
Hi, just joined the group. My name is Geoff. I live in Red River NM and I have a 24" Techtron dob and observe at 9,800ft. I would like to invite anyone who...
Dear All, I have a dob mount that I want to motorize. It previously had a Dob Driver II fitted. The simplest thing would be to fit another, but my e-mails to...
Hoping someone can help me understand how to make good connections for a crushed tube ends to the UTA bottom ring. I want to crush then end of the tube, and...
Hi Everyone,,, I am an aviation guy who cant afford the hobby any more,,, so in search of a new past time,,, I happened upon a 13.1 inch Coulter Oddessy 1. ...
I am wondering if anyone could recommend a place to have a mirrors reground and re-aluminized. Also where to find other parts to put a Newtonian together. bill...
Dear all, have some of you an idea of how many amateur astronomers are out there? For example S&T have about 80000 copies (if I remember well), but of course...
Astro Heads, One August night, high in the Andes; Simon, Bernard, and i bagged 101 Globular Clusters in a dusk to dawn Globular Cluster Marathon! i think...
Hi everybody, I would like to do some prime focus photography of the moon with my 22UC and my Canon EOS550D (Rebel T2i). Unfortunately, I cannot get a focused...
Hello to everybody in this group. Next year I am planning to start building 20" Dob. I have one simple question : Should I go with 2" thick mirror, or 1.8 or...
Hi, I own an Obsession 22UC and I wonder what is the widest FOV I can expect with it without any obstruction, vignetage... Right now, I am using a Nagler 5...
Dear all, A great majority of the large dobsonian scopes (over 24") in France have been made during the last 20 years, using astatic levers for the mirror...
I am trying to made roboscope out of Lightbridge12. For start I need large worm gear and willing to do it myself, but need AL disk about 16-20 inch in OD and...
Dear Bigdob Group, just joined you guys tonight and am curious to see the discussions coming up here. Reason for me to sign up is that I consider myself to be...
Hey Astro Heads, i've just completed a combination observatory/garage at the New Mexico Astronomy Village. You can view images in the Photo section of this ...
In the photo folder "Mike's 20" f/3.6 spheremount", I have placed a series of images briefly showing the steps I went through over the past few years, of...
Well this forum has been very quiet so I may as well try to liven it up. I live in the Southern hemisphere and have ordered a 40 inch F3 from a well respected...
My Sonotube Dob is 21" in diameter and I have been using large garbage bags to cover the ends when not in use. But if there is a lot of moisture in the air...
