You probably want a tracking mount if you want to keep the sky still.
Light-painting the foreground is the usual technique. You could
light-paint with flash but it can be a bit harsh sometimes.
Sometimes you could do it in a single exposure but often with digital they
are blended. Personally I think the single exposure method is more
interesting and challenging. And a must for film-only shooters.
An example (not mine):
http://www.fredmiranda.com/forum/topic/1307335
-Ed
>
>>
>>Just recall that the flash and ambient exposures are separate. If the
>>ambient exposure is a long one there's no reason why you can't make them
>>at different apertures. Experiment with the flash exposure at the same
>>ISO you intend to use for the ambient. Play with the aperture for the
>>flash till you get it to your liking. Then put the two together adding
>>the ambient after the flash and at a different aperture if desired.
>>
>
> So what you're saying is to take one photo of the sky itself and
>then another of the nearby landscape that's illuminated with the flash,
>then combine them? That seems like an interesting process. I was
>thinking of doing it with a single photo.
>
>
>Chris
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