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CHDK Works...for 1/4 second

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CHDK Works...for 1/4 second
« on: 29 / September / 2013, 17:00:16 »
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I'm sure I'm just missing something simple but I read the manual and did a bunch of Google searches on this forum and can't find a solution.  Just installed 1.2.0-3124 on my s100 with firmware 1.02a.  The description of the steps was perfect and got the CHDK flash screen on start-up.

I mainly want to force higher ISO to maintain better shutter speeds.   So I went in and changed:
- Enable Custom Auto ISO - *
- Min Shutter Speed 1/60s
- Max ISO Auto 3200

The problem is, when I half press, the correct/CHDK ISO/shutter shows for maybe 1/4 second, and then it reverts to the Canon selection.  So for example, it would show Auto ISO before the shutter is pressed, then at half-press show ISO 1600, Shutter 1/60th and then change to ISO 400, Shutter 1/15th.  I've half pressed an fully pressed the shutter a number of times and 1/60th is never maintained in low light (and therer's always room to move the ISO up to the maximum I put in).

So I tried other settings too and they just don't "stick", meaning that they only appear to work (e.g. Override ISO 3200 shows for 1/4 second).  The CHDK OSD shows the setting correctly (e.g. AUTOISO:ON).

What am I missing?  Upgraded the Firmware and verified the upgrade with Acid.  I tried both the Complete and Simple installs and the same behavior exists.  I even tried to download the pictures and see if they were different (in case the camera OSD and EXIF data was lying to me) but a Override ISO of 100 looked identical zoomed in as ISO 3200.  And of course Disable Overrides is off.

Any help would be appreciated.

Re: CHDK Works...for 1/4 second
« Reply #1 on: 29 / September / 2013, 17:06:48 »
Custom AutoISO is a somewhat complicated function.

Documentation is here : http://chdk.wikia.com/wiki/CHDK_1.2.0_User_Manual#Custom_Auto_ISO

Did you try simply overriding the ISO value from the CHDK enahnced photo operations menu instead?  (fifth item in the menu)
« Last Edit: 29 / September / 2013, 17:08:28 by waterwingz »
Ported :   A1200    SD940   G10    Powershot N    G16

Re: CHDK Works...for 1/4 second
« Reply #2 on: 29 / September / 2013, 22:05:18 »
Yup, tried that after I was having problems with the custom ISO.  Set the over ride to flat 100 ISO and flat 3200 ISO.  Just as with the custom ISO, it displays the override ISO for 1/4 second, then reverts back to what Canon would determine is appropriate.

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Offline lapser

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Re: CHDK Works...for 1/4 second
« Reply #3 on: 29 / September / 2013, 22:11:13 »
Yup, tried that after I was having problems with the custom ISO.  Set the over ride to flat 100 ISO and flat 3200 ISO.  Just as with the custom ISO, it displays the override ISO for 1/4 second, then reverts back to what Canon would determine is appropriate.
Did you try actually taking a photo, and looking to see what the ISO is on the picture in play mode?
EOS-M3_120f / SX50_100b / SX260_101a / G1X_100g / D20_100b
https://www.youtube.com/user/DrLapser/videos


Re: CHDK Works...for 1/4 second
« Reply #4 on: 01 / October / 2013, 20:54:56 »
Yes - ISO in Exif data show the Canon values.  Inspection of the photographs indicated that the images were approximately ISO 200 (as compared with photos taken at various ISOs using Canon settings).  This matched the Exif data and the display on the camera "after" the 1/4 second flash of the CHDK settings.

 

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