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.
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.
Post by jamesling1000 on Jun 1, 2011 3:37:26 GMT -5
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......
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 - 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.
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
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
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...
6" f15 Istar Achromat in a homebuilt OTA Homebuilt Equatorial Mount Brandon eyepieces