PROPCASE_SV_MARKET, PROPCASE_ISO_MODE, etc. - General Discussion and Assistance - CHDK Forum

PROPCASE_SV_MARKET, PROPCASE_ISO_MODE, etc.

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Offline RaduP

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PROPCASE_SV_MARKET, PROPCASE_ISO_MODE, etc.
« on: 24 / October / 2009, 19:22:35 »
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I think at least some of the ISO override related props changed for the SD980 and possibly for the other cameras in its generation, and I am having a hard time understanding the meaning of the following props:
PROPCASE_ISO_MODE On my camera, this seems to be related to the ISO of the camera, like 80, 100, 200, ... 0 for auto.
Is this what it is supposed to be?
The other 3 are PROPCASE_SV, PROPCASE_DELTA_SV, and PROPCASE_SV_MARKET. I have no idea what they are supposed to be, and what the normal values for them should be, both when the ISO is set as auto or set as a fixed ISO.

I would appreciate any insight on them.

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Offline fudgey

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Re: PROPCASE_SV_MARKET, PROPCASE_ISO_MODE, etc.
« Reply #1 on: 25 / October / 2009, 04:29:20 »
PROPCASE_ISO_MODE On my camera, this seems to be related to the ISO of the camera, like 80, 100, 200, ... 0 for auto.
Is this what it is supposed to be?
http://chdk.wikia.com/wiki/PropertyCase

Yes, pretty much. This is the user set ISO as it's shown on the screen. Slightly inaccurate compared to the actual apex96 value (and not in apex96 format either of course). It can also have the value 1 for "high auto iso" mode which enables use of the noisiest iso settings in autoexposure.

The other 3 are PROPCASE_SV, PROPCASE_DELTA_SV, and PROPCASE_SV_MARKET. I have no idea what they are supposed to be, and what the normal values for them should be, both when the ISO is set as auto or set as a fixed ISO.

As you can see from the wikia propcase page, I have no clue what that delta sv is (but then again I don't remember having tried to find out by experimenting either). PROPCASE_SV_MARKET and PROPCASE_SV update on half shoot. As with other exposure propcases, they are apex96. Market value is converted directly from the user set ISO value and the other one is what the camera actually uses for exposure (sometimes equal, often slightly off from the market value). Both can be found buried in the JPEG EXIF tag or its MakerNotes section.

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Offline RaduP

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Re: PROPCASE_SV_MARKET, PROPCASE_ISO_MODE, etc.
« Reply #2 on: 25 / October / 2009, 05:03:16 »
Thanks for the reply.
So  PROPCASE_SV_MARKET and PROPCASE_SV should be close to eachother, and near the the apex96 value of the PROPCASE_ISO_MODE, right?

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Offline fudgey

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Re: PROPCASE_SV_MARKET, PROPCASE_ISO_MODE, etc.
« Reply #3 on: 25 / October / 2009, 05:15:15 »
So  PROPCASE_SV_MARKET and PROPCASE_SV should be close to eachother, and near the the apex96 value of the PROPCASE_ISO_MODE, right?

Exact-amund'o. But not in automatic ISO mode or if you've recently adjusted ISO and haven't (half)shot yet.


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Offline RaduP

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Re: PROPCASE_SV_MARKET, PROPCASE_ISO_MODE, etc.
« Reply #4 on: 26 / October / 2009, 01:45:21 »
Ok, I got the SV and MARKET_SV..
What is the delta supposed to look like, any idea? Can you please check on your camera and tell me when does it change? For example, does it always change during halfshoot, or only if you change the iso_mode? And what values would it be around?

One more thing: Is the ISO_MODE displayed on the screen by the camera? I mean, if I change it during the halfshoot, is the camera supposed to print it on the screen? Because I am getting different values instead..

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Offline fudgey

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Re: PROPCASE_SV_MARKET, PROPCASE_ISO_MODE, etc.
« Reply #5 on: 26 / October / 2009, 14:10:19 »
What is the delta supposed to look like, any idea? Can you please check on your camera and tell me when does it change? For example, does it always change during halfshoot, or only if you change the iso_mode? And what values would it be around?

I couldn't deduce the logic from 2 minutes of half shooting but I'd think someone who gave it that name it would know better. Anyway looks like it's zero in manual ISO and changes during half shoot if in auto ISO mode. It sometimes gets negative value (I'm assuming 65525 on the prop debug view is negative). Typically it's 96 or below, with high ISO mode I could get it to up to 288 with some ISO800 half shots.

One more thing: Is the ISO_MODE displayed on the screen by the camera? I mean, if I change it during the halfshoot, is the camera supposed to print it on the screen? Because I am getting different values instead..

ISO_MODE only shows ISO when in manual ISO mode. I didn't know you could change ISO during half shoot except by overriding with CHDK, in which case you shouldn't trust any OSD stuff. Did I fail to understand the question?

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Offline RaduP

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Re: PROPCASE_SV_MARKET, PROPCASE_ISO_MODE, etc.
« Reply #6 on: 26 / October / 2009, 16:26:29 »
ISO_MODE only shows ISO when in manual ISO mode. I didn't know you could change ISO during half shoot except by overriding with CHDK, in which case you shouldn't trust any OSD stuff. Did I fail to understand the question?

Yes, that's what I mean, if overriding it via half shoot.
I was thinking it is displayed by the camera via a sprintf or something, so I thought it should be reliable, but I guess it's not..

 

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