|
Post by estrasse on May 30, 2011 2:32:52 GMT -5
Hi, new on this club, i show you my ISTAR 150 mm F/D15 : You can see how i make it on this page : astrosurf.com/zeubeu/lunette.htmlOn the moon there is not a lot of CA, just a little on the limb. I made some moon pictures with a DMK21, you can see them here : astrosurf.com/zeubeu/lune.htmOn saturn, no CA. I saw saturn on saturday nigth, the seeing was good but i didn't see lot of details, perhaps it is normal with 150 mm ? On a star when i make the focus, in intra and extra focale the ring are not perfectly circular. I would like to make another biggest refractor (250 mm F/D11), but i would have the certainty to have a good quality of the lenses. Fred My website : astrosurf.com/zeubeu/index2.html
|
|
|
Post by borispider on May 30, 2011 6:37:56 GMT -5
Welcome estrasse, glad you could make it.
What a great looking scope you have there. I like the aluminum look.
|
|
|
Post by Mike on May 30, 2011 15:32:27 GMT -5
Fred, Congratulations on finishing your scope. When vewing Saturn you speak of a lack of detail. Please elaborate. There's certainly no lack of detail on the moon images.
|
|
|
Post by estrasse on May 31, 2011 1:02:00 GMT -5
I just saw Cassini by moment, and no band on the planet. I think it is abnormal because seeing was very good and the view very stable. I'll begin again collimation, and i'll see if it is better. For rings who are spikey, i unscrew the lense because that can be the result of pinched optics.
When i test again i'll tell you if the view is better.
|
|
|
Post by plyscope on May 31, 2011 4:25:19 GMT -5
Good looking scope Estrasse!
There are usually a few things to adjust with a new build. Thank you for showing the pictures and please let us know if you need advice. Istar have been very good dealing with problems but sometimes it is just fine tuning that is required.
Andy
|
|
|
Post by estrasse on May 31, 2011 6:09:36 GMT -5
Yes, i think (i hoppe !!) tuning is required.
Fred
|
|
|
Post by Mike on May 31, 2011 14:21:44 GMT -5
Fred, I absolutely agree with Andy. A 6" should give you an appreciable amount of detail under good seeing conditions. Please let us know how it turns out after you "tweak" things.
|
|
|
Post by jamesling1000 on Jun 1, 2011 3:37:26 GMT -5
Hi Fred.
I also could not see the cloud bands of saturn from my 8" F8.8 Istar , during the last 2 Punggai star gazing trips. But at almost 400X , using an 4.8mm nagler eye piece, the view is sharp and crisp....no CA...., unlike the moon. So I am also not sure why last 2 weeks, with my 10" Mewlon, I can see the cloud bands easily at 500X. I will go back in early July, and hopefully this time I can get the video of the saturn using a zoom eye piece projection method...And this time I will check its collimation again......
REgards
James Ling
|
|
|
Post by estrasse on Jul 11, 2011 1:18:50 GMT -5
Hi, since my latest message i made new tests on saturday. I made new collim (just adjust a little), and i unscrew the lense. Effectively the lense was certainly pinched a little !! In intra and extra, the ring are circular, there is no rings who are spikley now !! With very bad seeing, i saw airy disk on Vega. It is very good for the future night on Jupiter !! ....
Fred
|
|
|
Post by Watcher3 on Jul 11, 2011 1:31:35 GMT -5
Glad to hear it Fred. Be sure to let us know how it does on Jupiter now.
Joe
|
|
|
Post by Mike on Jul 11, 2011 22:39:11 GMT -5
Fred - James, we had a 6" refractor and an 11" SCT side by side. The refractor showed greater detail of Saturn especially in the rings but the SCT showed more color (greater distinction of color bands). This is no doubt due to the greater light gathering ability of the 11". I am anxious to hear if the details have improved since your adjustments. Mike BTW Joe, I get a kick out of the fact that the spell check rejects the two most important words used on this forum: Istar and refractor
|
|
|
Post by Watcher3 on Jul 11, 2011 22:47:15 GMT -5
Yeh, drives me nuts!
|
|
|
Post by estrasse on Aug 7, 2011 13:55:02 GMT -5
Hi, another test and very good view now. I saw jupiter with airy disk around satellite !! Here a picture with barlow x2 and DMK 21.
|
|
|
Post by mikey cee on Aug 7, 2011 15:15:16 GMT -5
I have to ask someone who knows. The beautiful pic of Jupiter looks like a watercolor drawing to me. Some pics posted are perfect and some look like watercolors done in charcoal and brushes. What gives anyway??Mike
|
|
astrosean
Full Member
Jack and Jill
Posts: 50
|
Post by astrosean on Aug 7, 2011 22:08:07 GMT -5
Post image processing. That is the hardest part of imaging is what to do with the data. There are a lot of choices, routes and routines. The guys that produce very clear life-like renditons have had a lot of practice and are few and far between...
|
|