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Intervalometer Speed on SX260 - Can someone help?

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Offline lapser

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Re: Intervalometer Speed on SX260 - Can someone help?
« Reply #10 on: 22 / November / 2012, 13:42:30 »
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Quote from: waterwingz on 22 / November / 2012, 11:10:14
Let me know if you plan to use lapser's script and I'll leave this thread to him.  No sense in both of us working on this separately.

* Be aware that part of the way lapser's script gets  a short cycle time is to not make an exposure reading before every shot.  I can add that but I'm not sure that's what you want with a UAV ?
I like the idea of trying both scripts and comparing the results. But I think you'll do better to hold the exposure the entire time. The scene is changing so fast in a plane that it won't be pointing at anything long enough to measure exposure. It might be different at higher altitude, though.

After I stuff my face today, I'll be glad to modify the script to add the features you want, including setting the initial focus, and make it specific for an airplane. Do you really think you need the lens retracted for take off and landing? I think it would be interesting to see all those pictures. I'll add it as an option. I assume landing is rougher than take off, so it can be an option for each.

With the current script, it goes faster if you start it in continuous drive mode. With <alt> off (normal camera record mode), press <set> to get to the menu where you set the drive mode.

You might also want to try it in video mode, if you haven't already.
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Offline waterwingz

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Re: Intervalometer Speed on SX260 - Can someone help?
« Reply #11 on: 22 / November / 2012, 14:59:58 »
Quote from: lapser on 22 / November / 2012, 13:42:30
I like the idea of trying both scripts and comparing the results.
As I don't have a UAV,  I don't need to spend time on this if someone else is doing it.

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But I think you'll do better to hold the exposure the entire time. The scene is changing so fast in a plane that it won't
be pointing at anything long enough to measure exposure. It might be different at higher altitude, though.
Probably only going to find out by flying a few times both ways.

Although Andrew Hazelton can probably provide some guidance there.
http://www.andrewhazelden.com/blog/2011/02/easystar-vertical-format-aerial-photography-with-chdk/
http://chdk.setepontos.com/index.php?topic=6118.0
http://chdk.setepontos.com/index.php?topic=5577.0

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I think it would be interesting to see all those pictures.
You might also want to try it in video mode, if you haven't already.
The original request was for something to improve aerial mapping.  Neither of these apply.
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Offline lapser

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Re: Intervalometer Speed on SX260 - Can someone help?
« Reply #12 on: 22 / November / 2012, 16:37:16 »
@waterwingz

You sure know your CHDK! I didn't realize this was for aerial mapping. Thanks for the link.

I'll be happy to work on this script as a specialized version of time lapse photography. I'll use the modifications you made to your script as a guide, and would appreciate your suggestions.
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Offline andrewhazelden

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Re: Intervalometer Speed on SX260 - Can someone help?
« Reply #13 on: 22 / November / 2012, 16:40:15 »


For my needs I like having the simplest setup possible. When I take aerial photos with CHDK I use the Countdown Intervalometer script, set the focus to infinity ( Mountain icon), and manually set the exposure setting with a CHDK shutter speed override.

Here is an article on my blog that discusses shutter speed overrides.

The benefit of a manual exposure setting is that it stays constant for the whole flight and makes it easier to stitch the images into a mosaic using software like Microsoft Ice.

Regards,
Andrew Hazelden

P.S. As a side note, I would really like to see the CHDK UI Version 2.0 project add a LUA / UBASIC @param style array / list element.

This would be great for letting intervalometer scripts easily display shutter speed settings in a scrollable list from inside the CHDK scripts menu. ie. 1/250, 1/500, 1/1000, 1/1500
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Offline waterwingz

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Re: Intervalometer Speed on SX260 - Can someone help?
« Reply #14 on: 22 / November / 2012, 16:52:26 »
Quote from: andrewhazelden on 22 / November / 2012, 16:40:15
and manually set the exposure setting with a CHDK shutter speed override.
Thanks Andrew - I thought I remembered you posting somewhere about just locking things manually to get fast shutter speeds and overcome airframe vibration.

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Here is an article on my blog that discusses shutter speed overrides.
Naturally,  the new UI 2.0 changes a lot of that ...

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The benefit of a manual exposure setting is that it stays constant for the whole flight and makes it easier to stitch the images into a mosaic using software like Microsoft Ice.
I didn't even think of that one - thanks.  That means you must override the ISO setting too ?  How did you pick workable values ? Trial & error ?

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P.S. As a side note, I would really like to see the CHDK UI Version 2.0 project add a LUA / UBASIC @param style array / list element.  This would be great for letting intervalometer scripts easily display shutter speed settings in a scrollable list from inside the CHDK scripts menu. ie. 1/250, 1/500, 1/1000, 1/1500
There was some talk about that but I don't think anyone  (meaning philmoz) took it any farther.
Done.


« Last Edit: 22 / November / 2012, 16:54:54 by waterwingz »
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Offline philmoz

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Re: Intervalometer Speed on SX260 - Can someone help?
« Reply #15 on: 22 / November / 2012, 16:53:11 »
Quote from: andrewhazelden on 22 / November / 2012, 16:40:15
P.S. As a side note, I would really like to see the CHDK UI Version 2.0 project add a LUA / UBASIC @param style array / list element.

This would be great for letting intervalometer scripts easily display shutter speed settings in a scrollable list from inside the CHDK scripts menu. ie. 1/250, 1/500, 1/1000, 1/1500


You can use @values to do this.

Phil.
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Offline waterwingz

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Re: Intervalometer Speed on SX260 - Can someone help?
« Reply #16 on: 22 / November / 2012, 17:00:08 »
Quote from: philmoz on 22 / November / 2012, 16:53:11
You can use @values to do this.
Someone (me) should probably  update this :
http://chdk.wikia.com/wiki/UBASIC/TutorialScratchpad#The_Script_Header

I think its the best description we have but its missing stuff like @values.

@philmoz : do you recall where that was discussed (the forum search engine ignores the "@" and  floods searchs on only values).  I think it started here : http://chdk.setepontos.com/index.php?topic=8151.msg86294#msg86294
« Last Edit: 22 / November / 2012, 17:05:11 by waterwingz »
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Offline philmoz

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Re: Intervalometer Speed on SX260 - Can someone help?
« Reply #17 on: 22 / November / 2012, 17:06:46 »
Quote from: waterwingz on 22 / November / 2012, 17:00:08
Quote from: philmoz on 22 / November / 2012, 16:53:11
You can use @values to do this.
Someone (me) should probably  update this :
http://chdk.wikia.com/wiki/UBASIC/TutorialScratchpad#The_Script_Header

I think its the best description we have but its missing stuff like @values.

@philmoz : do you recall where that was discussed (the forum search engine ignores the "@" and  floods searchs on only values).  I think it started here : http://chdk.setepontos.com/index.php?topic=8151.msg86294#msg86294

http://chdk.setepontos.com/index.php?topic=8151.msg86287#msg86287

Phil.
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  sx130is (1.01d & 1.01f)
  ixus310hs (1.00a & 1.01a)
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  g1x (1.00e, 1.00f & 1.00g)
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Offline alkasber

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Re: Intervalometer Speed on SX260 - Can someone help?
« Reply #18 on: 22 / November / 2012, 17:35:18 »
Quote from: waterwingz on 22 / November / 2012, 11:10:14
Let me know if you plan to use lapser's script and I'll leave this thread to him.  No sense in both of us working on this separately.

Hi, you're right. You came in my rescue very fast and been helpfull ever since, and I liked your script so if you don't mind I do prefer your UAV script. :)

This last script you posted worked very well,

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I also changed the printout so that it tells you how far each shot is ahead/behind that rate. 
* Be aware that part of the way lapser's script gets  a short cycle time is to not make an exposure reading before every shot.  I can add that but I'm not sure that's what you want with a UAV ?

Yes, your script shows that I get a minimum intervall of 1 shot every 3.5 seconds, that is nice for 150 meters (450 ft) and 60km/h (16mt/s) with a SX260 and a good picture overlap. I use a professional mosaic software for orthomosaic and Digital Elevation Models. But 3.5 seconds is too slow for lets say 80 meters (260 ft) and very hight resolution maps. I think Andrew already answered your question, I want only one exposure. So I did read Andrew article but now I have a question, if I lock up my exposure in 1/2000 will the script try to change this or your script will be locked in 1/2000? I don't need the "press" action as lapser implemented, since I will use manual to infinity focus (easy to setup without a script) and the locked exposure.

So I think it will be only one modification...  since I still don't know how the lock exposure in chdk works (overrides or not the exposure part in scripts?) I will explain...

1) I want to set the shutter speed override to a value I need, via CHDK menu. lets say, 1/2000 and I will set manual focus to infinty via camera operation.  Your script right now is getting exposure every shot, the speed I getting with lapser script is the ideal for me and the first picture exposure only action suits UAV mapper very well.

I'm still a bit confused, if I override and lock the shutter speed in CHDK, when I start the script will it try to get a different exposure? And what mode should I use in the camera? Shutter priority or manual or?

Hope I could explain it to you, and thanks again.

A L K
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Offline andrewhazelden

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Re: Intervalometer Speed on SX260 - Can someone help?
« Reply #19 on: 22 / November / 2012, 17:47:56 »
Quote from: philmoz on 22 / November / 2012, 16:53:11
You can use @values to do this.

Phil.

Phil, thanks for the tip! That is a CHDK feature I wasn't aware of. I will have to try out the @values command by updating several of my CHDK scripts.

Regards,
Andrew
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