Have you got in camera noise reduction enabled?
If so, after each 30-second exposure, it will take a 30-second dark frame.
You might want to disable that and take your dark frames manually.
So, set 30 seconds for the exposure and set the interval to 32 or 33 seconds, which will give enough time to write the file to the card.
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Last edited by Octane; 26-05-2014 at 03:39 PM.
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