I started out by taking 30 second exposures and thought that was the way to go maybe 50 x 30 second exposure....but since then I have found by doing 20 x 2 minute exposure's provide much more detail then I could ever wish to get on 30 seconds.
Then throw in a dark site and go for 10 x 5 minute exposures.
And obvioulsy with this new requirment I have the same problems Andrew has just mentioned.
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