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

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Offline outslider

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Star trails;)
« on: 09 / October / 2011, 18:57:15 »
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Hello!

I tried to shoot a star trails and here's my first nice image;) It's sum of around 70 raws. The photo shows the trails of 2.5 h of stars movement.

I like to see your photos (if any);) Who else interested?
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Offline acseven

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Re: Star trails;)
« Reply #1 on: 10 / October / 2011, 13:55:37 »
Wow, really cool! I guess you had some urban lights below that make it glow a bit on the bottom side, but other than it's really cool, congrats!
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Offline outslider

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Re: Star trails;)
« Reply #2 on: 10 / October / 2011, 14:35:25 »
Than you;)

Well, there were some lights, however it's not a cause of the glow.

This glow appears in all my very-long-exposure photos. It not depends on the position of the camera and lights. I guess it's caused by hardware (not intendend for 2 hours exposure...)

Also, when I tried to convert WAV raw file to jpg directly on camera it was rather orange than green-blue...;)

Unfortunetly I have no window facing north to take star trails around the Polaris:/
« Last Edit: 10 / October / 2011, 14:37:55 by outslider »
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Offline imtheguy

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Re: Star trails;)
« Reply #3 on: 26 / February / 2012, 18:25:24 »
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.





« Last Edit: 04 / March / 2012, 08:05:14 by imtheguy »
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Offline outslider

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Re: Star trails;)
« Reply #4 on: 27 / February / 2012, 05:42:25 »
First one is especially cool! Nice exposure of trees.
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Offline acseven

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Re: Star trails;)
« Reply #5 on: 27 / February / 2012, 09:38:19 »
Quote from: outslider on 27 / February / 2012, 05:42:25
First one is especially cool! Nice exposure of trees.
ditto!

Really cool.
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Offline oronocova

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Re: Star trails;)
« Reply #6 on: 27 / February / 2012, 10:07:40 »
Ditto on the first one.  Do you just have to make sure the camera is pointed more north or south to get the circle effect?  That's awesome.
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Offline outslider

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Re: Star trails;)
« Reply #7 on: 27 / February / 2012, 10:54:43 »
Circles are around the Polaris star (not exactly, but the shift of the center is very little). So to get circles you have to have Polaris on photo. In general - north :)
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Offline imtheguy

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Re: Star trails;)
« Reply #8 on: 04 / March / 2012, 07:45:51 »
Quote from: outslider on 27 / February / 2012, 05:42:25
First one is especially cool! Nice exposure of trees.

The best star trail shots always include some foreground for reference, even if it's something you must illuminate with flash or paint with flashlight.

OK, Fixed the link to the Elph300 sample above.  Reason I included it is because I have been unable to turn off DFS with the latest release, albeit Alpha, CHDK.  The camera has a wonderful 24mm wide lens for this kind of work but requires a program called StarTracer to fill in all the gaps created by DFS.

Until I can get DFS off, or find another 24mm lens camera where DFS works, StarTracer is the answer.

TIP - You can also use StarTracer to extend the trails if your session was cut short with clouds or crappy battery.
« Last Edit: 04 / March / 2012, 08:09:59 by imtheguy »
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Offline imtheguy

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Re: Star trails;)
« Reply #9 on: 04 / March / 2012, 08:17:37 »
One more around Polaris just to show how sweet the old A560 is with a working DFS and even in cold nights with 15sec exposures gets 1,100 frames from a pair of AA Lithium batteries.  My problem with this much longer exposure is the narrow 35mm lens of the A560 as well as no interesting foreground. 



As OUTSLIDER noted above, Polaris does slide around a bit over the course of 3 hours.
« Last Edit: 04 / March / 2012, 08:19:21 by imtheguy »
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