jupiter image with red and blue hue

[alcol620]

Hi Folks

I have produced from images obtained from Sharpcap and Registax. My scope is a Celestron 8SE using a Solar System CCD Imager (equivalent to a Celestron NexImage) and a 2xBarlow. Images were taken on the night of 16th April what was reasonable seeing (I think) in the Southeast of England.

I notice that the image has a distinct red hue on one side and blue on the other. Any ideas what may have caused this and how can I improve on the image?

Thanks for any help given. PS I am very new to astrophotography, only 4 or 5 nights in the dark.

[Mukv]

greetings

this is called chromatic aberration and can be caused by low quality lens this link can give more information http://en.wikipedia.org/wiki/Chromatic_aberration have you tried to image without the barlow see if you still have the issue.

Andy

[knobby]

SCT shouldn't do this... Its probably the Barlow or atmospheric distortion or possibly just processing.

try the rgb align in Registax

[alcol620]

Thanks Andy and Knobby for taking time to respond. Knobby, presumably the reference to SCT is the telescope type?

Alec

[riklaunim]

If Jupiter was low on the sky then it was atmospheric dispersion. By default SCT or average known brand Barlows won't add noticeable chromatic aberration.

[knobby]

Thanks Andy and Knobby for taking time to respond. Knobby, presumably the reference to SCT is the telescope type?

Alec

yep...

[alcol620]

Knobby 

Have adjusted the rgb on Registax and the above image shows the improvement

[knobby]

That's better! Well done

[alcol620]

For those who have seen my final Registax photo of Jupiter, what has to be done to get more definition and clarity when taking webcam video. Are there secrets I am missing is is a lot to do with 'seeing' conditions?