Quote:
Originally Posted by Peter.M
While a good idea in theory, its application would be limited I think. If you are imaging broadband data, say luminance, by the time your guider has picked up that the star has exceeded the tolerance the frame is already smeared. If you were aiming to get the sharpest data, the aim would be to not have the star go outside your tolerance in the first place.
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Of course that would be better.
It's a question involving timing - however -
if I look at a guide graph I can see a sharp excursion starting from the normal graph
& if I had a shutter button I could close the shutter & wait till
the excursion had reached it's peak & started heading towards zero before opening it again.
Surely the image would be better?
We're looking here for any improvement without spending megabucks.
To get good results in a closed loop system you need what's called a " nested loop. "
One loop could be at 1 second every second e.g the guide camera &
another much faster at 10 times a second such as adaptive optics.
Yes you'll get better results that way as you have a nested loop.
The loop at 1/10th of a second refines the first loop to increase the accuracy.
cheers
Allan