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Reducing the minimum exposure speed in High-speed Burst HQ mode

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Re: Reducing the minimum exposure speed in High-speed Burst HQ mode
« Reply #20 on: 01 / March / 2014, 18:50:56 »
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Are they? I didn't see those options anywhere..
Ported :   A1200    SD940   G10    Powershot N    G16

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Offline longtalker

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Re: Reducing the minimum exposure speed in High-speed Burst HQ mode
« Reply #21 on: 01 / March / 2014, 18:58:58 »
I don't have the Fallback options, only Second Alternative options...

Re: Reducing the minimum exposure speed in High-speed Burst HQ mode
« Reply #22 on: 01 / March / 2014, 19:19:55 »
I don't have the Fallback options, only Second Alternative options...
What version of CHDK are you using? ( Miscellaneous -> Show Build Info )
Ported :   A1200    SD940   G10    Powershot N    G16

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Re: Reducing the minimum exposure speed in High-speed Burst HQ mode
« Reply #23 on: 01 / March / 2014, 19:21:23 »
1.2.0-2246


Re: Reducing the minimum exposure speed in High-speed Burst HQ mode
« Reply #24 on: 01 / March / 2014, 19:57:15 »
Looks like the menu string was changed at some point.  It does the same thing.  Did you try enabling it?
Ported :   A1200    SD940   G10    Powershot N    G16

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Re: Reducing the minimum exposure speed in High-speed Burst HQ mode
« Reply #25 on: 01 / March / 2014, 20:01:54 »
Sorry not really sure what you are referring to...

Should I use a different CHDK version or can I find those fallback options somewhere? It would seem that the range would have to be constrained to an upper limit of 400 by default for the camera behaviour to be explained

Re: Reducing the minimum exposure speed in High-speed Burst HQ mode
« Reply #26 on: 01 / March / 2014, 20:21:19 »
Sorry not really sure what you are referring to...
Should I use a different CHDK version or can I find those fallback options somewhere? It would seem that the range would have to be constrained to an upper limit of 400 by default for the camera behaviour to be explained
I think that the Fallback menu option is the same thing as the Second Alternative  menu option.   The text in the menu was changed at some point to try and be more understandable.  But the underlying code does the same thing.

Set the Second Alternative shutter speed to 1/4 second and the Second Alternative ISO to 1600?
Ported :   A1200    SD940   G10    Powershot N    G16

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Re: Reducing the minimum exposure speed in High-speed Burst HQ mode
« Reply #27 on: 02 / March / 2014, 04:09:02 »
Tried it... Exposure still doesn't go beyond 1/8s though, and ISO never exceeds 400 :(
What else can I try? Thanks a lot for your help btw.


Re: Reducing the minimum exposure speed in High-speed Burst HQ mode
« Reply #28 on: 02 / March / 2014, 09:56:01 »
Tried it... Exposure still doesn't go beyond 1/8s though, and ISO never exceeds 400 :(
What else can I try? Thanks a lot for your help btw.
To start with, I'd suggest updating to the current stable version of CHDK (1.2.0-3364) just to elimate any doubt about some unrelated bug fix changing things.

The code is a bit hard to follow, but for the Fallback Max ISO value to be used,  the required shutter speed needs go be below the specified Minimum Shutter speed.  For purposes of this experiment,  I tested like this :



and was able to confirm that it would use the Fallback Max ISO of 1200 if the Fallback Min. Shutter Speed was set to 1/60S rather than Off.   When it was set to Off,  the ISO used was 200.

Can you confirm this works as I have described on your camera when it is setup the same way?   If so, then its a question of fiddling with the values ( like Minimum Shutter speed) to see what makes it work for you.
Ported :   A1200    SD940   G10    Powershot N    G16

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Re: Reducing the minimum exposure speed in High-speed Burst HQ mode
« Reply #29 on: 02 / March / 2014, 10:42:38 »
Thank you so much, I really appreciate your help! I will try this when I'm home later, and will report back

 

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