Quote:
Originally Posted by Alchemy
going to grill you for information, probably do this for a while so get used to it 
Was this frame rate for all the colours, are we talking LRGB, how many frames for each color and what time length from first frame to last frame (interested in rotation issues). thats it for now  |
No worries Alchemy, keep asking questions.
I used 15fps for all the colour channels, though the gain varied between channels. The green channel is the brightest, red is a little dimmer, and blue is the dimmest by a fair margin. So I adjust the gain between channels to keep the histogram at around the same point for each channel.
Sometimes that means reducing the framerate for blue (eg: 30fps for red and green, 15fps for blue), but with Jupiter still fairly low and nowhere near as bright as it will get, at 30fps the histogram was only half full in green channel.
I captured for 40s each colour channel, giving me 600 frames in total. I stacked about 170 from each colour channel. It takes about 10 seconds between colour channels to change filter, change settings and double-check focus.
So there is some rotation between the first frame of the red channel, and the last frame of the blue channel - no doubt about it. But within each channel (40s) there is no rotation. What that means is that you need to align on the features within the planet when recombining into RGB, rather than aligning on the limb. You'll get a slight (1-3 pixels) red edge on one side and blue edge on the other side.
Hope that helps.