Astrophotography Intervalometer Script? - Script Writing - CHDK Forum
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Astrophotography Intervalometer Script?

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Offline Mirfak

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Astrophotography Intervalometer Script?
« on: 25 / August / 2008, 14:53:00 »
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Is there an astrophotography intervalometer script around somewhere?  Wanted to check before attempting to write one.  Specific features:

1) Set MF to infinity.
2) Set manual exposure.
3) Multiple use of custom timer. Since the camera will be in manual mode, no need to set exposure after each shot.  Number of exposures required will determine how many shots to specify for custom timer and how many times to loop the timer.
4) Ensure that dark frame noise reduction is off at the beginning of custom timer sequence.  At the end of each sequence, turn DF noise reduction on and take dark frame (this will take two shots at the given shutter speed).
5) Possibly increase or reduce shutter speed after each sequence (ensuring not to exceed slowest time limit).
6) Possibly reading sensor temperature at the beginning and end of each sequence to determine if to take the dark frame (if the temperature appears to be deviating at bit). (Collaborative build only feature).

Thx.
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Offline MaxMan

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Re: Astrophotography Intervalometer Script?
« Reply #1 on: 25 / August / 2008, 19:01:27 »
just write it! :-)
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Offline Mirfak

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Re: Astrophotography Intervalometer Script?
« Reply #2 on: 25 / August / 2008, 20:53:13 »
Yeah, I'll give it a go....just thought that I'd check first.
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Offline vostok

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Re: Astrophotography Intervalometer Script?
« Reply #3 on: 28 / August / 2008, 03:50:01 »
Quote from: Mirfak on 25 / August / 2008, 14:53:00
4) Ensure that dark frame noise reduction is off at the beginning of custom timer sequence.  At the end of each sequence, turn DF noise reduction on and take dark frame (this will take two shots at the given shutter speed).

What will you gain of taking a dark frame with and internal dark frame reduction done in-camera? This kind of dark frame can't be used for dark-calibrating the stellar images. If you manually substract dark frames, they're supposed to be taken without the "noise reduction".
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Offline Mirfak

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Re: Astrophotography Intervalometer Script?
« Reply #4 on: 30 / August / 2008, 12:57:58 »
Quote from: vostok on 28 / August / 2008, 03:50:01
Quote from: Mirfak on 25 / August / 2008, 14:53:00
4) Ensure that dark frame noise reduction is off at the beginning of custom timer sequence.  At the end of each sequence, turn DF noise reduction on and take dark frame (this will take two shots at the given shutter speed).

What will you gain of taking a dark frame with and internal dark frame reduction done in-camera? This kind of dark frame can't be used for dark-calibrating the stellar images. If you manually substract dark frames, they're supposed to be taken without the "noise reduction".

Yes, you've got a point.  I overlooked that turning on DFNR doesn't just take a dark frame but also applies noise reduction as it says in the name..duh! Dammit!  Will have to wait until the developers figure out a way to take a dark frame only (if that's at all possible).  If they could figure out a way to apply more than 3 stop exposure reduction to the ND filter, that might be an alternative.  I'll mention this in another forum to see if it makes sense to anyone.
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Offline Mirfak

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Re: Astrophotography Intervalometer Script?
« Reply #5 on: 30 / August / 2008, 14:47:54 »
Quote from: Mirfak on 30 / August / 2008, 12:57:58
Quote from: vostok on 28 / August / 2008, 03:50:01
Quote from: Mirfak on 25 / August / 2008, 14:53:00
4) Ensure that dark frame noise reduction is off at the beginning of custom timer sequence.  At the end of each sequence, turn DF noise reduction on and take dark frame (this will take two shots at the given shutter speed).

What will you gain of taking a dark frame with and internal dark frame reduction done in-camera? This kind of dark frame can't be used for dark-calibrating the stellar images. If you manually substract dark frames, they're supposed to be taken without the "noise reduction".

Yes, you've got a point.  I overlooked that turning on DFNR doesn't just take a dark frame but also applies noise reduction as it says in the name..duh! Dammit!  Will have to wait until the developers figure out a way to take a dark frame only (if that's at all possible).  If they could figure out a way to apply more than 3 stop exposure reduction to the ND filter, that might be an alternative.  I'll mention this in another forum to see if it makes sense to anyone.

Appears that the developers know how to take a dark frame by closing the shutter.  So it's a question of implementing this feature on the various camera models.
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