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It could be. I've also been thinking that where the first ring starts is also about where the brightness starts to drop off as well. I was using a moderate gain and quite a bit of brightness. Though I tried twice in registax with different filtering parameters. I used default as registax chose it (FFT 3 and Quality 5 and 50) the first time and I upped the FFT filter to abut 9 or 10,and set the quality filter at around 4 and reduced the with to about 15 the second time. Didn't make a great deal of difference though. So I guess its something to work on.
I'll keep an eye on Jupiter for a transit and try your idea next time.
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