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I photographed our local Canada Day fireworks last night, using a three-camera set-up. Two Canons, one with a wide zoom, the other with a tele, and the GXR with a ZM21 for a wider view than the wide SLR (was set at 35mm on an APS-H crop).
I decided to try the GXR because it has a built-in intervalometer function, which for fireworks is extremely useful. Just set up the camera with the desired framing and let the intervalometer take care of the work while you then enjoy the show, or tend to the other cameras.
One drawback of the GXR vs. the Canons was that it does a time-equivalent dark frame subtraction for noise reduction purposes. I didn't look extensively, but couldn't find a way to turn this off. The problem of course is that for a 30 second exposure, you lose 30 seconds waiting for the camera to process the dark frame. The Canons no longer have this limitation (my earlier Canons did), so it's just a matter of locking the electronic cable release open with the frame advance set to continuous.
Comparing the results, I think the GXR's NR was excessively strong. Maybe it was because it was already late, but last night I just couldn't get the GXR images to match the colour quality of the Canon files...
Anyway, here are some results:
The show was only about 15 minutes long, so given that each 30 second exposure consumed one minute, I only got a handful of images with the GXR, which was OK because it was really a test to see how it would work.
And, breaking the rules a bit, here are a few from the Canons (either 1DIV or 1DIII):
I posted more on my blog: http://www.ronscheffler.com/blog/?p=764