View Full Version : The telescope works

07-11-2003, 12:11 PM
A couple of images I took last night with the new scope. I used a cheap webcam connected to my laptop. These pics are a stack of 30 frames using a great freeware program called Astrostack.



07-11-2003, 12:38 PM
Great pics! Ain't it great when things work out?

Were those taken with an afocal setup? I've been threatening to make an afocal adapter for my cheap little camera (I have a Celestron C5+). Where did you get the Astrostack software?

Keep lookin' up,

07-11-2003, 12:54 PM
Thanks Rick,

Taken with webcam with lens removed at prime focus using an adapter to the focuser.

www.astrostack.com (http://www.astrostack.com)

07-11-2003, 09:19 PM
Neat pictures-no pretty girls with thin curtins in your area ? http://bbs.homeshopmachinist.net//biggrin.gif

07-11-2003, 10:51 PM
Nahh, I can't even see my neighbours. Did have one come into my shop the other day, wow, OH SH*t here comes my wife, see ya

07-13-2003, 01:48 PM
Thanks for the info Evan. I'll have to start working on an adapter now that I can stack pictures.

Dusted the telescope off today. Wow! There are a lot of sun spots right now.


07-13-2003, 04:32 PM
How did you ever get that good a focus Evan? You have really sharp edges. Did you use a Hartman disk?

07-13-2003, 11:27 PM
Awesome images!

Paul Gauthier
07-13-2003, 11:39 PM
Really nice Evan.

Paul G.

07-14-2003, 12:26 PM
The focus is crisp because the optics are the best. The primary and secondary mirrors are 1/10 wave accurate and aligned with a laser collimater I made. It is said that you can tell good optics because when focusing all of a sudden the image "snaps" into focus. It's true. With poor optics that doesn't happen because there is no point when it really is in focus. I wouldn't spend 500 hours building this telescope and then put crappy optics in it. This is a device intended to be passed down to my grandchildren after I am gone. I have twin grandsons so I built my double arm drive and this telescope for them. Now I have to think of a third project. My son recently informed me that his girlfriend is pregnant and that I am to become a grandfather once again! Since I like to do detail work I was maybe thinking of building an orrery.


I do hope you are not using an eyepiece sun filter. They are very unsafe and may crack from heat instantly blinding you. The only safe way to observe the sun is with a full aperture filter such as a Bader or by eyepiece projection. Eyepiece projection is not recommended because the heat buildup in the eyepiece may damage it.

[This message has been edited by Evan (edited 07-14-2003).]

07-14-2003, 09:26 PM
Not to worry Evan. I use a full aperture filter, that as a matter of fact, I made using the Bader (Baader?) solar screen.

I should have put that warning in my post when I wrote it, and I apologize to the group for not doing so! I was excited about getting an old toy out and playing with it and didn't think about how others would take it

I agree with you about eyepiece projection too. It seems to me that I've usually seen that being done with small refractors using (more than likely) one of the older air spaced eyepiece designs (Hyugens?), and I think that would be the way do go if that's what you wanted to do. Even with one of those eyepieces though, I don't think I would want to bounce all of that sunlight off of the secondary mirror in my Schmitt/Cass style scope. Things might get a little toasty inside!