Star trails - Creative Uses of CHDK - CHDK Forum
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Star trails

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Offline fbonomi

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Star trails
« on: 23 / April / 2008, 18:50:49 »
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This is a stacked series of 123 25-seconds shots, giving a virtual exposure of about one hour.

Shot with JPG, dark-frame subtraction, stacked in groups of 5 and then combined to enhance stars visibility

This is just a test, it was done a few days ago with a strong moon, I expect that in really dark, moonless nights the results would be much more impressive

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Offline fbonomi

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Re: Star trails
« Reply #1 on: 23 / April / 2008, 18:55:32 »
Here:
Star trails
a mediocre test of assembling the same frames in a time-lapse, assembling 5 shots in each frame and rotating them:

Brame A: 1 2 3 4 5
Frame B: 2 3 4 5 6
Frame C: 3 4 5 6 7

etc.
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Offline acseven

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Re: Star trails
« Reply #2 on: 23 / April / 2008, 18:57:07 »
nice, cool shot
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Offline mrproper

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Re: Star trails
« Reply #3 on: 23 / April / 2008, 19:40:11 »
Good show!

I'm thinking about star photography myself, but with the use of a barn-door (for static star shootings).
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Offline e2b

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Re: Star trails
« Reply #4 on: 24 / April / 2008, 21:47:48 »
Photographing star colors in star trails

If you progressively change the focus during a long star trail exposure you can see the many different colors of the stars. Start with the stars out of focus and progressively improve the focus so that the last one in the sequence is sharp.

This works well with a camera that allows long time exposures, and it should work with stacking separate exposures the way fbonomi has done.

It takes trial and error to find out how much to shift the focus between exposures. Fifteen minutes is a sufficiently long exposure time.

fbonomi, I hope you have a clear night to try this, so you can post the results here!

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