Star trails;) - page 4 - Creative Uses of CHDK - CHDK Forum

Star trails;)

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Re: Star trails;)
« Reply #30 on: 04 / October / 2012, 18:13:10 »
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Here is my first:




Thanks for the help everyone!
G12

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Offline brizo

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Re: Star trails;)
« Reply #31 on: 05 / October / 2012, 09:02:17 »
That's awesome, what were your settings and what script did you use?

Re: Star trails;)
« Reply #32 on: 05 / October / 2012, 09:07:30 »
That's awesome, what were your settings and what script did you use?

Thanks!  I was very please with the results.  I started pretty early in the evening.  I am sure that is why it is so bright.

I didn't use a script.  My G12 came with an external intervalometer.  I set it to take a picture every 20 seconds.  I configured the camera like this:

ISO 800
F-STOP 2.8
Manual focus – Infinity
15 Second Exposure

The only CHDK feature I used was to turn off DFS.

What you see is about 45 minutes worth of exposures.  I acquired more, but they were earlier and they significantly brightened the image after I ran it through startrails(http://www.startrails.de/html/software.html).
« Last Edit: 05 / October / 2012, 09:12:21 by whatalesyou1 »
G12

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Offline brizo

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Re: Star trails;)
« Reply #33 on: 05 / October / 2012, 09:11:52 »
Im very impressed! I've only began to try these myself recently so hopefully with the nights getting darker I'll  be out more often, thanks for sharing the settings, I'll try those out


Re: Star trails;)
« Reply #34 on: 05 / October / 2012, 09:16:39 »
Im very impressed! I've only began to try these myself recently so hopefully with the nights getting darker I'll  be out more often, thanks for sharing the settings, I'll try those out

My pleasure!   :D
These setting were a compilation of what I could find from other users.  I would like to try something more ambitious next.  I would like to

1.  Acquire cartrails during daylight hours (not sure about exposure factors for that)
2.  Acquire lightning shots (I'll need to wait on that, as we are entering winter here)
3.  Timelapse from dusk through full dark (not sure about exposure factors for that either)
G12

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Offline brizo

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Re: Star trails;)
« Reply #35 on: 05 / October / 2012, 11:44:42 »
Sounds interesting, i was in Canada over the summer and there were some crazy lightning storms, unfortunately i hadn't read up on lightning shots before i went! The cartrails during daylight would be good, an nd filter would help im sure

Re: Star trails;)
« Reply #36 on: 08 / October / 2012, 09:39:42 »
Sounds interesting, i was in Canada over the summer and there were some crazy lightning storms, unfortunately i hadn't read up on lightning shots before i went! The cartrails during daylight would be good, an nd filter would help im sure

Apparently, the G-series cameras have been equipped with a built-in ND filter for some time.  Guess I better go back to my manual...  :P
G12

Re: Star trails;)
« Reply #37 on: 10 / October / 2012, 01:12:20 »
Picked up an A1200 while on vacation about two weeks ago and put CHDK on it the same day :D  Was itching to try some star trails but my "vacation" was in Cleveland Ohio visiting my parents so I didn't bother trying any star trails.  Now I'm back home in Yuma AZ and while I'm really itching to get out into the desert for some good dark skies figured I'd give it a quick try from my backyard first.

Pretty happy with the results!  I think I had the overrides set to give a 20 second exposure, though I'm still not totally clear on how to work CHDK so I may have been off on that.  I also accidentally left RAW files on which I thought I had disabled so that probably helped eat my batteries a little quicker.  Still I was about to get 70 frames off of an almost fresh set of Lithium AA's over about 36 minutes before the batteries were toast.

I did turn off DFS but neglected to shoot any dark frames to use in post.  Just stacked them with a free startrails program I found with a quick google search and then a quick levels adjustment in photoshop to tweak the exposure.

Need to pickup some new NiMH's or rig an external power source soon since desert camping season will be starting soon and I'll have some REAL dark skies to work with! 


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Offline bluephilosopher

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Re: Star trails;)
« Reply #38 on: 10 / October / 2012, 16:18:24 »
Time to pump up this thread.  I am new to CHDK  and this my first post but an old hand programmer and expect to have a ball here.  Here are my first 2 tries at star trails.  Its a blast.  Many thanks to all the devs who produced this. First shot with Canon A560 and mere 5 sec jpg, about 400.  Second with Elph300 and 15sec exposure till cold killed battery at 220 frames.




hey imtheguy, I could not see the second foto which is taken with ELPh 300. I have the same one running with CHDK. Could you tell me how you set your ELPH 300 for taking the star trail?

thx

Re: Star trails;)
« Reply #39 on: 10 / October / 2012, 18:53:01 »
Picked up an A1200 while on vacation about two weeks ago and put CHDK on it the same day :D  Was itching to try some star trails but my "vacation" was in Cleveland Ohio visiting my parents so I didn't bother trying any star trails.  Now I'm back home in Yuma AZ and while I'm really itching to get out into the desert for some good dark skies figured I'd give it a quick try from my backyard first.

Pretty happy with the results!  I think I had the overrides set to give a 20 second exposure, though I'm still not totally clear on how to work CHDK so I may have been off on that.  I also accidentally left RAW files on which I thought I had disabled so that probably helped eat my batteries a little quicker.  Still I was about to get 70 frames off of an almost fresh set of Lithium AA's over about 36 minutes before the batteries were toast.

I did turn off DFS but neglected to shoot any dark frames to use in post.  Just stacked them with a free startrails program I found with a quick google search and then a quick levels adjustment in photoshop to tweak the exposure.

Need to pickup some new NiMH's or rig an external power source soon since desert camping season will be starting soon and I'll have some REAL dark skies to work with!

I like your pic!  It turned out pretty good!  Was it windy?  Is that why the tree is blurred?  What is in the upper-left?

If you are looking to shoot some shots in a more "urban" environment, check out the info here:

http://longexposuretips.blogspot.com/2011/06/how-to-top-tips-for-star-trail-success.html
G12

 

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