... regarding ... or ... organization, ... ready ... If you think CS is bad, try MEAD in Irvine. It only took 3 months for them to finally decide they...
105931
synthiemoogin
Sep 1, 2008 12:18 pm
Thanks to the help recieved on this board, I was able to find an even more flexible alternative than the stock reducer. I ordered the AP 2" compression ring...
105932
daniela daniela
daniela_dani...
Sep 1, 2008 11:58 pm
I suspect the lack of comment is caused by the fact that everyone has been laughing hard for the last 20 hours or so, and can't seem to stop.... Yes of course...
105933
Christopher Go
stone_1990
Sep 2, 2008 1:07 am
This was a frustrating night! It was partially cloudy with fast winds. It was also cloudy only at the area around Jupiter! It alternated between over cast...
105934
Robert Harris
robertnharri...
Sep 2, 2008 3:02 am
Rod, I haven't laughed that hard in a long time :-) I will no longer be annoyed when my kitties insist on rubbing their heads against the tripod legs all...
105935
Rod Mollise
rmollise
Sep 2, 2008 12:35 pm
Great story...though it was even more interesting initially...early in the mornin' I read that as "my Australian _sheep_, Molly"... LOL Peace, Rod Mollise ...
105936
Mike Hackett
hudson_yak
Sep 2, 2008 2:15 pm
There was a topic posted here awhile ago that seems like it could be applicable to this. It didn't get much discussion at the time. ...
105937
Andre Paquette
majikthyze
Sep 2, 2008 4:03 pm
I don't think that collimation can be used to cancel the effects of dispersion, at least not completely. That was my experience when trying to collimate on...
105938
Rod Mollise
rmollise
Sep 2, 2008 4:09 pm
The only practical way to eliminate this differential refraction (other than letting Jupe get higher, which for some folks is a long-time prospect), is to use...
105939
Chris Peterson
cloudbait
Sep 2, 2008 4:14 pm
Agreed. There's no overlap between the effects of atmospheric dispersion and collimation. You'll never reduce dispersion by miscollimation! To get the best...
105940
Andre Paquette
majikthyze
Sep 2, 2008 5:08 pm
Although shifting the colors in post-processing does help, relative dispersion of an object at 25 degrees elevation can be quite significant across the...
105941
Robert Piekiel
piekielrl
Sep 2, 2008 5:14 pm
Hello Everyone, Please check out this link: http://www.astromart.com/classifieds/details.asp?classified_id=583123 (You don't need to be a registered Astromart...
105942
Mike Hackett
hudson_yak
Sep 2, 2008 5:47 pm
If I'm following this correctly I guess what's being said is that the benefit observed above (the premise of this topic) is mostly due to mechanical primary...
105943
Roger Laureys
roger_laureys
Sep 2, 2008 6:13 pm
Hi Robert, That's good news. We were waiting for this one! Congratulations. I order one ( see my reply through Astromart ). Roger Laureys Hasselt Belgium ...
105944
rbethman
rbethman1
Sep 2, 2008 6:33 pm
Mike, I'm not sure WHAT this is telling us. Primary mirror flop should NOT be THAT extensive. I've got an original N8 and do NOT have the issues described....
105945
gnowellsct
Sep 2, 2008 9:43 pm
Collimation is a mechanical issue not a dispersion issue. And I wouldn't expect an 8" SCT to have this problem. That's a small lightweight mirror. The...
105946
Andre Paquette
majikthyze
Sep 2, 2008 9:55 pm
I only chimed in because you had referenced the post I made a while back regarding dispersion. I wanted to be clear that if collimation improves things, then...
105947
rbethman
rbethman1
Sep 2, 2008 10:02 pm
Well - DUH! You'd have to be pretty dense to NOT know collimation is an opto-mechanical issue! Dispersion is another matter entirely. Seeing CAN be involved as...
105948
Mike Hackett
hudson_yak
Sep 2, 2008 10:59 pm
Your second paragraph here is sort of where I was going with this...wondering how good the Jupiter moon collimation can be if there are dispersion effects...
105949
Robert Piekiel
piekielrl
Sep 2, 2008 11:06 pm
Hi Roger, Thanks, I sent you a reply through astromart. Shipping to Belgium is $13, making the total $42.95. You can use either of these addresses for paypal: ...
105950
rbethman
rbethman1
Sep 2, 2008 11:08 pm
Mike, The re-collimation on Jupiter's moon, bringing it into a nice tight round ball of light would seem to rule out disperson issues. Note the use of...
105951
Mike Hackett
hudson_yak
Sep 3, 2008 12:01 am
While I'll admit to mostly just looking at the pictures in that report my intepretation of what it was telling me was that an in- focus collimation on a...
105952
Christopher Go
stone_1990
Sep 3, 2008 12:21 am
Seeing was excellent this evening. Again, I had to deal with clouds that seem to enjoy teasing me by covering Jupiter every now and then. Note the bluish...
105953
Fred
PoppaFred
Sep 3, 2008 1:12 am
There was a time in the Deep South that even metioning his name could result in a tail whupping... Fred Charleston, AR ... him...who she referred to as "old...
105954
David Cochran
davidcochran...
Sep 3, 2008 2:49 am
Hi Christopher I will start saying that I admire your work with Jupiter, your images are outstanding to say the least. Second...Do you have a spare room? I...
105955
David Cochran
davidcochran...
Sep 3, 2008 2:52 am
Hi all Is it normal to have an object move inside the eyepiece while focusing? It seems that at some points the mirror shifts. peace David...
105956
Christopher Go
stone_1990
Sep 3, 2008 2:59 am
Thanks David! I do have a spare room. 8) Actually, a lot of people have already visited me to see my seeing. In fact, one of the greatest planetary imagers,...
105957
Chris Peterson
cloudbait
Sep 3, 2008 3:15 am
This happens with all SCTs. But it shouldn't move enough to be a problem (that is, even at the highest magnifications, the object shouldn't move out of the...
105958
P T Chambers
phil11111111
Sep 3, 2008 3:19 am
Hi Most SCTs focus by moving the primary mirror back and forth. It is mounted to what I call, a "slider" and it moves back and forth on the primary baffle. So...
105959
David Cochran
davidcochran...
Sep 3, 2008 3:43 am
Thanks Chris and Phil! It's not terrible, the movement is slight and as soon as I detect it i go the other way and go back to the direction I was going at it...
