Motion detection with high shutter speed not working - General Discussion and Assistance - CHDK Forum
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Motion detection with high shutter speed not working

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Offline Michael L

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Motion detection with high shutter speed not working
« on: 18 / January / 2008, 13:33:44 »
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I'm trying to photograph hummingbirds using high shutter speeds (1/10,000 and faster) and motion detection.  The high shutter speed with flash sync is working great by itself, and the motion detection is working great by itself.  However, when I set the high shutter speed and then start the motion detection script running, the high shutter speed no longer works and the camera's normal (non-CHDK) shutter speeds are used.  I am using Allbest's most recent  build for the S3 IS (allbest-s3is-100a-16.zip ).

If someone can tell me if there are settings which will enable me to use both features at the same time, I'd be most grateful.
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Offline Barney Fife

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Re: Motion detection with high shutter speed not working
« Reply #1 on: 18 / January / 2008, 18:43:53 »
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« Last Edit: 22 / April / 2008, 09:35:04 by Barney Fife »
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Offline Michael L

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Re: Motion detection with high shutter speed not working
« Reply #2 on: 19 / January / 2008, 11:27:08 »
Thanks very much for your reply.  I'm using Allbest v16. 

I can't really see where to downland Fingalo's last build.

After posting here, I saw that there was another forum "General Help and Assistance on using CHDK stable releases"
Not knowing where my issue was more appropriate (is Allbest considered stable?  is this a CHDK development issue?), I posted this issue to that thread.

Someone replied that I have to use the set_tv96_direct X command in my script.    Now you suggest that I could use the set_prop command to set the shutter speed from within the script itself.

To the other suggestion I replied that I didn't really understand how to calculate the value of X I needed for the set_tv96_direct X command from that thread he had pointed me to.  The example showed the command where X is the corresponding *96 value for the shutter speed.  For 65s X=-576.

I was trying to shoot with a shutter speed of 1/10,000 and an aperture of f4.48.

Sorry, but I'm a total newbie here.  Can anybody tell me either what the correct  set_tv96_direct X  commands (or set_prop commands) would be to correspond with a shutter speed of 1/10,000?   I assume there's also a script command to specify aperture?   What script command would I use to specify an aperture of f4.48?  How do I determine what values to use in the commands for other shutter speeds and apertures?  I assume these commands would be added to the motion detection script?

Thanks very much in advance!

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Offline Allbest

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Re: Motion detection with high shutter speed not working
« Reply #3 on: 19 / January / 2008, 16:47:03 »
Quote from: Barney Fife on 18 / January / 2008, 18:43:53
I presume the Allbest Build?
It still has some bugs in it that prevent any of the override settings from working within scripts,
Hi, Barney!
I don't know anything about such bugs in version 16.
Use set_tv96_direct and set_av96_direct in your scripts and everything will be good :)
Quote from: Barney Fife on 18 / January / 2008, 18:43:53
unless you use the more involved set_prop command to set that shutter speed from within the script itself.
Sorry, but this command is inapplicable for above aims (overriding exposure parameters)
Quote from: Barney Fife on 18 / January / 2008, 18:43:53
and editing wiki pages where nobody else cares to help ... and it's getting to the point that I don't even care to answer these forum questions anymore
Barney, I think that your contribution in CHDK popularization is great! Thank you!

Quote from: Michael L on 19 / January / 2008, 11:27:08
Someone replied that I have to use the set_tv96_direct X command in my script.
Hi, Michael!
That's true.
Quote from: Michael L on 19 / January / 2008, 11:27:08
To the other suggestion I replied that I didn't really understand how to calculate the value of X I needed for the set_tv96_direct X command from that thread he had pointed me to.  The example showed the command where X is the corresponding *96 value for the shutter speed.  For 65s X=-576.
Please read this article http://en.wikipedia.org/wiki/APEX_system#. It helps you to understand meaning of this values. Let "t" is shutter speed, then relation between tv96 an t is tv96=96*log2(1/t)
Thanks :)
« Last Edit: 19 / January / 2008, 16:52:36 by Allbest »
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Offline Michael L

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Re: Motion detection with high shutter speed not working
« Reply #4 on: 19 / January / 2008, 21:55:41 »
Hey, Allbest!

Thanks for the confirmation of which commands to use, and for the link to the article about the APEX system.  I set myself up a spreadsheet to find the values of tv96 and av96 for corresponding shutter speeds and apertures.  My tests confirm that I'm using the correct values, at least for aperture, which I can read from the EXIF data.

Awesome job on your CHDK build.  I came upon CHDK because of my interest in kite aerial photography.

http://www.flickr.com/photos/ml_kap/sets/530065/

I'm hoping that when CHDK is available for the SD870 IS or SD800 IS (both with 28mm equivalent lenses) that I'll use the intervalometer scripts to trigger the camera.  I am currently using the heavier and slower Canon S70 with IR triggering, but the newer SD cameras don't have the IR sensors.

The other CHDK features are so cool, though, that I can't resist messing with them, such as the high shutter speeds and motion detection capabilities.

Thanks again and keep up the good work!!
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Offline Barney Fife

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Re: Motion detection with high shutter speed not working
« Reply #5 on: 20 / January / 2008, 03:21:12 »
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« Last Edit: 22 / April / 2008, 09:35:27 by Barney Fife »
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Offline Michael L

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Re: Motion detection with high shutter speed not working
« Reply #6 on: 20 / January / 2008, 05:23:48 »
Thanks, Barney Fife.  I created a spreadsheet that works, but the one you pointed me to was much simpler and cleaner.

Everything is working the way I had hoped now that I've included the set_tv96_direct and set_av96_direct commands within the motion detection  script. 

The hummingbirds are sleeping now, as I should be, but I'll be trying to photograph them tomorrow.

I totally appreciate the help from you guys!!
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Offline Barney Fife

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Re: Motion detection with high shutter speed not working
« Reply #7 on: 20 / January / 2008, 10:36:07 »
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« Last Edit: 22 / April / 2008, 09:35:46 by Barney Fife »
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Offline Allbest

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Re: Motion detection with high shutter speed not working
« Reply #8 on: 20 / January / 2008, 14:09:42 »
Quote from: Barney Fife on 20 / January / 2008, 03:21:12
Allbest, as far as bugs in #16, I stopped testing scripts when I found out that any of the override values chosen from the CHDK menus have no effect when the "shoot" command is used in a script.
Hi, Barney! It's not a bug. It's a feature. :) I think that the script and the "direct shoting" are two different natures and in the script all desireable values must be seted internally. Do you have another opinion? :)
Quote from: Barney Fife on 20 / January / 2008, 03:21:12
Many others have also reported that none of the scripts work properly with your builds, I thought you would have noticed this.
One problem that I know at present time is script size. Small bug with zoom video will be corrected ant next build...
« Last Edit: 20 / January / 2008, 14:14:35 by Allbest »
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Offline PhyrePhoX

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Re: Motion detection with high shutter speed not working
« Reply #9 on: 20 / January / 2008, 15:33:51 »
Quote from: Allbest on 20 / January / 2008, 14:09:42

Hi, Barney! It's not a bug. It's a feature. :) I think that the script and the "direct shoting" are two different natures and in the script all desireable values must be seted internally. Do you have another opinion? :)



hm maybe add another option like "override in scripts" as well, so the set_tv parameter are used in EVERY situation? and if you untick the "override in scripts" option you have to use the set_tv command in the script. suggestion :)
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