Star trails - Creative Uses of CHDK - CHDK Forum

Star trails

  • 4 Replies
  • 4501 Views
*

Offline fbonomi

  • ****
  • 469
  • A570IS SD1100/Ixus80
    • Francesco Bonomi
Star trails
« on: 23 / April / 2008, 18:50:49 »
Advertisements
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


*

Offline fbonomi

  • ****
  • 469
  • A570IS SD1100/Ixus80
    • Francesco Bonomi
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.

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

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).


*

Offline e2b

  • *
  • 37
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!


 

Related Topics