Hi All, I was just wondering if anyone has any experience or opinions with these scopes. I'm specifically looking at getting a fast scope for astrophotography ...
Hello, I have a question in regards to star testing my home made 12.5" f/7 Newtonian: When I perform the star test, I see nice crisp diffraction rings outside...
Maybe these will help: http://www.willbell.com/tm/tm5.htm http://aberrator.astronomy.net/ "My advice is free and worth every penny!" -Christopher Erickson ...
Thanks Christopher, I actually have both of these references, and I've tried over the years to match what I read there and simulated with what I'm seeing. ...
I might suggest trying different eyepieces too. I have found it much more difficult doing star tests using Naglers and Radians than when using Orthos. I am...
_Amateur Telescope Making_ by Ingalls recommends that mirrors typically be undercorrected because they are typically used while the air is cooling. The...
Indeed Chris, I'm a firm believer in simplicity. The most complicated eypiece that I have been using is a Plossl. Otherwise, I'm using an orthoscopic. ...
Thanks William, The way I tested the mirror when I was figuring it was to perform the test before doing any polishing. This way it was at room temperature. ...
hi group, just wondering how much is too much with regard to mirror clip placement on the mirror edge. i have an old cave mirror and cell. seems to collimate...
-i have an old cave mirror and cell. i notice with the star testing especially using a video camera the outermost diffraction ring gets 'deflected' by the...
I recently aquired the OTA for a Meade short-tube 4.5". I believe they use a barlow in the focus tube to lengthen the focal length to something like 1000mm....
I had thought about building a 203mm f4 telescope for imaging from old starfinder tube and extra parts I have lying around. If I done this what size secondary...
hi kevin, i believe the program that can help you is in the files section- newt25.zip. it's been awhile since i used it but i believe that is the one. with the...
On 17 Feb 07 Kevin wrote: "I had thought about building a 203mm f4 telescope for imaging from old starfinder tube and extra parts I have lying around. If I...
You've been pointed to some good sources. I run a spreadsheet I have, and it suggests a secondary minor axis of 60mm. I'll be interested in what you find from...
The best article is one I wrote for ATM journal which is included in a collection of best articles- titled "The Best of Amature Telescope Making Journal-Volume...
In a message dated 2/18/2007 1:42:50 PM Eastern Standard Time, drgenovese@... writes: building in the ability to slide the primary mirror forward or...
No No!-the focal length does not change!-if you have an 8" F/6 the prime focus will be 48" from the primary. Suppose with the stanard setup the focus is 5" out...
I was able to find a few sparse comments on these telescopes. There aren't many around. I think there are about 250 18 inchers and I believe they told me once...
"There aren't many around. I think there are about 250 18 inchers" Do you know for sure that figure is really for real? I'm sure that you are telling what...
... that you are telling what you believe to be the truth, but 250 scopes that large and expensive, for our little bitsy hobby? ... High-End Dob production,...
Dear members, At the risk of sounding like a total newbie, I'm preparing to step up to a bigger & better scope that is much more versitile than what I have...
... the ... all ... seem ... purpose ... astrophotography. ... the ... logic ... than ... HI LEW I BOUGHT A LXD75 SN-10 AND I LOVE IT. I PUT A ORION 80MM...
On 28 Feb 07 Lew wrote: "I'm looking at three different scopes: The Celestron C10-N GT, the Orion 10 EQ w/Atlas mount and the Mead LXD SN-10 AT(Schmidt-Newt.),...
Lew, I can't comment on the other scopes, but I have had a Celestron C10N-GT for over a year now and am very happy with it. The views are excellent, and the...
A must see! http://www.astro-physics.com/index.htm?whatsnew/madeinamerica Triple-check your local broadcast time. "My advice is free and worth every penny!" ...
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