mike-in-ak Offline Upload & Sell: Off
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Over the course of night's shooting, I will vary the ISO and shutter speed as needed.
When a display has a lot of "definition" such as spikes and rays, I try to drop the shutter speed to isolate those elements.
A fast moving display can ripple across the sky in less than 10 seconds.
Many's the time I came home with a bunch of amorphous blobs because of a slower shutter speed. But sometimes you need a longer speed to be able to pick up faint light. And then she'll bloom into a display so bright you can read a newspaper.
You do a lot of "chimping" and constant setting changes.
Jim, I usually start with aperture priority, ISO 1600, lowest ƒ-stop and take a test shot. Then I check the results and the histogram and go from there. One night I went from ISO 400 up to 6000 and shutter speed from .3 seconds out to 30 seconds. She was changing that much in both speed and brightness.
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