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IS management in CHDK menu

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Offline morel

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IS management in CHDK menu
« on: 06 / February / 2013, 03:35:58 »
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Is there any way to turn off IS (in IS series cameras) directly from CHDK menu? It will be very usefull for bracketing photos (on tripod, or for HDR). Now one must go to camera menu, turn off IS, then go to CHDK menu, set up bracketing override options and then do bracketing photos series.
If he doesn't turn off IS, each image will be a bit tilt than any other in series. It makes some difficulties in further image processing - alignment, overlaying etc.
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Offline waterwingz

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Re: IS management in CHDK menu
« Reply #1 on: 06 / February / 2013, 09:17:49 »
Quote from: morel on 06 / February / 2013, 03:35:58
If he doesn't turn off IS, each image will be a bit tilt than any other in series. It makes some difficulties in further image processing - alignment, overlaying etc.
There is currently no way to disable IS from the CHDK menu.  It might be possible to do something clever from a Lua script (maybe using event_procs') but I don't believe anyone has tried that yet.

But I'm confused.  I did not realize that image stabilization changed anything if the camera was stationary?  Is that true?  And if the camera is not perfectly stationary then there will be differences between photos anyway?
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Offline pigeonhill

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Re: IS management in CHDK menu
« Reply #2 on: 06 / February / 2013, 09:28:51 »
Not a solution, however, when I use my auto bracketing scripts I set up a custom Canon menu on my S95 and G11 with all the right settings in place, eg manual focus, as I use the HFD in my script, no IS, fixed WB etc.

Cheers

Garry
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Offline waterwingz

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Re: IS management in CHDK menu
« Reply #3 on: 06 / February / 2013, 09:44:12 »
Quote from: pigeonhill on 06 / February / 2013, 09:28:51
Not a solution, however, when I use my auto bracketing scripts I set up a custom Canon menu on my S95 and G11 with all the right settings in place, eg manual focus, as I use the HFD in my script, no IS, fixed WB etc.
Another somewhat painful solution is to use press() or click() commands in a script to navigate the Canon menus and change the Canon setup (including IS) that way.   

You could then even implement the HDR code in your script so that one shutter press does it all.  No need to setup custom timers in the Canon menu and bracketing parameters in the CHDK menu.  It all done in the script.

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Offline Pier

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Re: IS management in CHDK menu
« Reply #4 on: 06 / February / 2013, 10:36:06 »
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But I'm confused.  I did not realize that image stabilization changed anything if the camera was stationary?

Canon SX130 IS User Guide says:
• If camera shake is too strong, attach the camera to a tripod. You should also set the IS Mode to [Off] when the camera is attached to a tripod.
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Offline waterwingz

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Re: IS management in CHDK menu
« Reply #5 on: 06 / February / 2013, 10:57:14 »
Quote from: Pier on 06 / February / 2013, 10:36:06
Canon SX130 IS User Guide says:
• If camera shake is too strong, attach the camera to a tripod.
Classic advice with or without image stabilization.

Quote
You should also set the IS Mode to [Off] when the camera is attached to a tripod.
The only reason I can see for this advice is that if IS mode is not needed you should turn it off to save battery life and maybe to reduce "shutter lag"?

I guess is should be easy to take a couple of CHDK DNG images with a tripod mounted camera and IS turned on and then post-process those images in  "Subtract Mode" to look for any differences.  That would show whether IS affects your HDR images or not.

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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline Pier

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Re: IS management in CHDK menu
« Reply #6 on: 06 / February / 2013, 12:44:25 »
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I guess is should be easy to take a couple of CHDK DNG images with a tripod mounted camera and IS turned on and then post-process those images in  "Subtract Mode" to look for any differences.  That would show whether IS affects your HDR images or not.

Agree with that.But I read somewhere that the camera is trying to do his job and IS motor is trying to stabilize.That reflects photos...
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Offline outslider

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Re: IS management in CHDK menu
« Reply #7 on: 06 / February / 2013, 14:53:48 »
i've been playing with IS on and off on tripod some time ago and the difference is visible (sx130).  It's not a big thing, but turning it off simplifies post-processing.
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Offline pigeonhill

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Re: IS management in CHDK menu
« Reply #8 on: 06 / February / 2013, 15:06:14 »
Waterwingz

You've got me thinking now regarding switching off IS and setting other settings from a script that calls press and click. I'm on travel for a week so will have time to play!

I guess I will need to put in a few if/then checks as one can not guarantee where the script will start from.

As you say, once coded in a script it is then painlessly invoked every time, through the script.

Cheers

Garry
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Offline pigeonhill

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Re: IS management in CHDK menu
« Reply #9 on: 06 / February / 2013, 15:07:58 »
BTW

Some modern cameras have intelligent IS, that senses if the camera is on a tripod, and switches out IS.
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