Jupiter and Venus - But funny outer circle in Jupiter??

midnight (Darrin) · #1 03-10-2010, 10:18 PM

Greetings all again,

I spent some time outside again last night experimenting with the AVI capture of my 40D with the liveview. I think this has a lot of potential for those who haven't gone into CCD territory yet and a bit budget conscious. Have a look at Malcolm's posts (mswhin63) to see what this avenue of capture has the potential of!

Anyway, this is Jupiter and Venus with the liveview AVI done through my LXD55. By the way, this my first ever Venus capture and boy was it difficult to get with all that turbulence in the atmosphere!

I am still wrestling with Registax and all of the these are done by Regi but if you look closely, Jupiter has what appears to be a processing/stacking circle inside roughly 90% of diameter of the image. Has anyone seen this before? Maybe I am hitting the wavelet too hard but I something tells me it's not the wavelet but perhaps the way it is aligning.

The 2 Jupiters are using the same rig but different exposure and different harshness in the processing to emphasise the mystery "circle"

If anyone has any ideas, I would be much grateful. I used a single point alignment (centre of gravity works very poorly when Jupiters satellites are in the frame).

Oh, apologies for the dodgey looking satellites in these posts. I haven't worked out how to "round" them a bit to make it a bit more visually appealing. These are basically unprocessed except for the wavelet filter in Registax. Photoshop is on my radar for targetting some skill acquisition

. There's also a black dot on the lower right. Initially I thought it may have been dust but I think it may be the shadow of one of the satellites. Taken at about 10:30pm lastnight.

Thanks for looking

Darrin...

mswhin63 (Malcolm) · #2 03-10-2010, 11:03 PM

I get the same thing as well, I feel it has something to do with turbulence v shutter v something else. Most of mine are like this as well.

TrevorW · #3 04-10-2010, 12:05 AM

The images displayed are very good Darrin, well done.

ballaratdragons (Ken) · #4 04-10-2010, 12:16 AM

The effect is called Onion Rings and is very common. Don't panic, everyone got them at first

I still get them whenever I try Joop

No wonder I don't like planetary imaging

One of the Planetary guys will be along shortly to tell you how they got rid of them

I think it is caused by Wavelettes

asimov (John) · #5 04-10-2010, 05:01 AM

Well, a DSLR is not really the tool for this kind of work, but your good self (& Malcolm) are really wringing the DSLR's neck in this respect, so great job guys.

The ringing is *basically* caused by under exposure. On a webcam, you'll have way better tools at your disposal to control this. Waveletts only accentuate what is there, but not the cause. There is no 'one thing' that causes onion ringing. It's a combination of things hence my *basic* answer

I recommend the next step to be; pulling the trigger on a webcam if you truly want to get serious about planet imaging.

mswhin63 (Malcolm) · #6 04-10-2010, 12:55 PM

The issue is definately atmospherics, as mentioned before I had the same problem, last night I managed some more imaging with some astounding results compared to my previous images.
Gonna take a little more time to manage the processing. Did change my avatar today to reflect the new image. Will post the new one once I finshed it all. I also managed a webcam shot as well. Still very good so far but the DSLR is better (so far).

midnight (Darrin) · #7 06-10-2010, 08:29 PM

Quote:

Originally Posted by TrevorW

The images displayed are very good Darrin, well done.

Thanks Trevor. Spending a bit of time on this to get a feel for my gear.

Quote:

Originally Posted by ballaratdragons

The effect is called Onion Rings and is very common. Don't panic, everyone got them at first

I still get them whenever I try Joop

No wonder I don't like planetary imaging

One of the Planetary guys will be along shortly to tell you how they got rid of them

I think it is caused by Wavelettes

It certainly can catch you by suprise but believe it or not, it's actually "good" to see others have experienced this before so I am little at ease in that it may not be a one off due to a fault in my optics.

Quote:

Originally Posted by asimov

Well, a DSLR is not really the tool for this kind of work, but your good self (& Malcolm) are really wringing the DSLR's neck in this respect, so great job guys.

I recommend the next step to be; pulling the trigger on a webcam if you truly want to get serious about planet imaging.

I love your choice of words : wringing -and yes I want to wring every last drop out of it !!

I want to make sure my basic skills are up b4 I decide to pursue more detail - that US dollar is looking attractive at the moment $$$ - just need more $$$.

Quote:

Originally Posted by mswhin63

The issue is definately atmospherics, as mentioned before I had the same problem, last night I managed some more imaging with some astounding results compared to my previous images.

My main concern was whether it was to do with the setup of the optics or the DSLR operating in such an unusual manner. It would be really dissappointing to get all excited and go to a good CCD only to find the same problem lurking around there. Will need to investigate more. Good luck Malcolm!!

Cheers,
D...

mswhin63 (Malcolm) · #8 06-10-2010, 08:39 PM

I dont think you will get these problem with a more advanced CCD imager, even my webcam images do not show these artifacts.

I mentioned before I had some good images from the DSLR I have re-processed them leaving more headroom to squeeze out of it.

http://www.iceinspace.com.au/forum/s...5&postcount=11

I may look at them again but gonna leave it for the moment.