The only thing missing in the picture lineup is a comparison to a large apature binocular like my 16" which is like the image that the 25" gives but wider...
Hello everyone, I'm currently designing a truss tube dob with a 13.1 inch primary. I was wondering what kind of cell would adequately support this 1 inch ...
Hi, I'm no expert, and i've only done one cell and its not complete. I used a Program name PLOP which you can search using Google or Yahoo search. or download...
I have the same miror. Using plop, the best is a 6 point cell. I've glued it with silicones blobs. I'll send you one picture and an avi Raphaël Guinamard ... ...
... That's pretty fast delivery if you just received it; the auction ended only half an hour ago: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3818184994...
... I've got two Tom O. platforms as well. They're great. Tom was a bit "iffy" about putting this particular 'scope on this particular platform. I've gone...
A water based Polyurethane will "bleach" the wood and deemphasize the grain. This is the type of finish that professionals use on hardwood floors. It goes on...
I am interested in hearing experiences of anyone who has built the Catsperch Pro chair. I am considering going that route and I'm wondering if anyone has built...
I built one and loved doing so. Easy and fun to build and very nice to look at (I used oak) and use. Check out the telescope_observing_chair group on yahoo. ...
Hello everyone, After acquiring a recently recoated 13.1" Coulter primary for FREE, I've decided on building an "Obsession" style truss tube scope to put it...
... FREE, ... Berry's ... the ... secondary ... Kevin, A couple comments and a question. Not sure what you mean by folding distance of 17 inches. If your cage...
Your secondary cage needs to be larger, or you'll be vignetting some incoming off-axis rays. For 2" EPs, it should be about 2" larger than the primary. So...
... some ... than the ... account ... 7.5+.25+3=10.75" ... ~= 2.4" ... by .05". I logged onto the group tonight to ask basically the same question. I followed...
That question is entirely up to the user. A smaller secondary gives better contrast, better planet viewing, but a small 100% illuminated field, and the risk...
Why don't you contact the mirror manufacturer and ask them what they recommend? If your tube diameter is between 1 7/8 and 2 inches larger than the primary, ...
It was late for me when I made this post last night. With my current calculations, the folding distance would be about 10.25", not 17"....I used the...
Since astromart banned my account for advertising my dob on their site as well as ebays I'm posting this here to see if anyone is interested. 25" f4.0 dob....
I put the reason in my previous but here is a better explanation. They banned my account because I advertised my 14" dob on Astromart while it was advertised...
The answer is his message. You can't advertise on Astromart and Ebay at the same time. Herb will ban you as soon as he finds out. Ok I'll bite. Why did they...
More accurately, you can't advertise the _same item_ on Astromart and another auction site at the same time. You can run into all kinds of legal hassles if...
... question. ... a ... do ... Craig, I'll try and help you visualize what's going on. I'm gathering from your message that you're not sure what the numbers...
I've been on ebay since early 1997, and on a regular basis advertise stuff locally as well as on ebay. If it sells locally before the auction ends, I end the...
