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Great first light. Not sure about using lower ISO's, 800 seems about ideal. Too low and you just take longer to get the same thing.
in summer you may want ISO1600 when the camera is running hotter and you may end up with a better signal to noise ratio.
Also if you can it is better to run a DSLR off a power supply rather than its internal battery which heats up as the long exposure goes along.
Greg.
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