Gain settings and ringing effect

Hello guys,

I was wondering why all my late images of Jupiter seem to be cursed by a very heavy ringing effect, whereas last year I never had this problem. Then I recalled that this year I decided to record with lower gain settings to avoid the overexposed images I was getting after processing last year. I guess I went a little too far.

Can anyone suggest a good rule of thumb to set the gain when imaging Jupiter and Saturn (although I did not have any problem with Saturn, as yet, it would be very good to know).

Thanks
Ciao
Luca

Try to set your gain as high as possible. But don't overexpose any part of the jupiter. You probably can avoid the problem.

Clear Skies
GY
http://planets.lamost.org

BTW, lower gain settings won't help avoid the overexpose caused by processing. Sharpening usually caused the problem. So after stacked images turn the contrast(or brightness) lower before sharpening it.

Wish this helps,
GY
http://planets.lamost.org

For Jupiter I typically set my gain to 30-50%. This image, it was set at about 40%. I have learned to set saturation to 100% and keep gamma at 0. I set K3CCD brightness at about 130-140 and lower the contrast in Registax to between 80-90% before saving the processed image.

http://glory.gc.maricopa.edu/~pmaxson/Jupiter/Jupiter0308txt.jpg

Paul Maxson