Jupiter Strangeness

[TopHouse]

Has anyone seen this effect before? I did jupiter tonight, twice, I don't think i did anything different than I have done before, but both pictures have these concentric rings coming out from the center of the planet, I've over processed a bit to show them more, but they are there with very little processing, anyone any idea what they could be?

[Space Cowboy]

I've had that problem too not sure what causes it though. Great image btw!

[TopHouse]

Thanks, but it's perplexing me, can't figure out what it is at all. It's not apparent from just looking at the two shots above but if you click one and it enlarges you will see it.

[barkis]

They look very Newtons rings like to me. Do you have any mating surfaces such as filters, or dampness on anything between the camera sensor and the incoming light?

A shot in the dark I know, but anything else is hard to suggest. Can't detect them extending beyond the planets disc though, so the Idea might be up the creek.

Very Odd.

Ron.

[TopHouse]

They look very Newtons rings like to me.

Ron.

Nope, they're definitely mine! ;o)

They do only cover the planets disk and there's only the IR block filter on the camera nose, definitely strange.

EDIT

Just remembered, there were barlows involved too.

[Nick Smith]

The dreaded onion rings! A contrast effect caused by the centre of the planet being much brighter than the outside. It can normally be remedied by increasing the camera gain at capture.

Cheers

Nick

[TopHouse]

Nick, you are the oracle of all knowledge! Thanks for that, I had actually emailed Gary Honis and I got this reply :-

------------------------

Hi Dion,

The rings are known as the "onion ring" effect and it is caused either by

your webcam or your processing. The Toucam should not have the onion ring

effect unless there is a mechanical problem with your webcam. When I tested

the Logitech Pro 9000, it had the onion ring effect on Jupiter.

----------------------------

I know my cam isn't jiggered and I didn't think I really did anything different in processing, so will fiddle with the gain next time I'm out.

[ezza123]

I have had that happen when I push the sliders too much in Registax- Or is this without pushing the sliders?

[TopHouse]

Oh i always push the sliders lol