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Originally Posted by Vermin
Definitely the finishing, if you are saving as jpeg, the DSP (digital signal processing) from the raw image data would be the most power hungry bit.
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I beg to differ, i used 1 battery for the nights session with 30 x 1 minute exposures and downloaded them by USB to the computer running DSLR Focus V, and it still had half a charge to go.
So i would bend towards the battery being a problem. When they go, they go fast.
There pretty cheap on ebay, i got 6 for $10.00 each. They work great, as long as you cycle them by using them 1 at a time, and not 1 all the time.
That way all batteries get good use and you have more spares rather than throwing them away 1 at a time.
Use your old one and strip it and install a regulator in it to use for really long nights.
Just a final thought, are you using mirror lockup ?.. if not, you should, as theres a drain for current alone.