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Thanks guys.
Matt - I captured for 2 minutes in Red and 1 minute in Green and Blue. Red and Green @ 30fps, Blue @ 15fps.
For Mars, you can easily capture for 5 minutes without problems with rotational blurring. And probably even longer. Like Jupiter, it's only going to give you a slight red and blue fringe on the limbs if you go too long overall.
Because we're working with mono cameras, as long as the individual colour channel is around 2 minutes, then if registax stacks a frame at the start and end of that 2 minutes, they'll be fine. Over the whole RGB capture period, you might have gone for 6 minutes, but each individual channel will show no rotational blurring - when you combine the channels into a colour image, you would choose to align on the central features, leavnig a slight blue/red fringe on the limbs if you captured too long.
Like Anthony has said with his Jupiters, he captures for 1 minute in each colour channel - and at the long focal length he uses, Jupiter definitely rotates from the start of the red channel to the end of the blue channel, but each individual colour channel is sharp. It's better to have more frames to stack to make the middle (interesting) parts of the image smoother and more detailed, than to worry too much about 1 or 2 pixels of fringe colour.
Thanks
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