Aperture Limit Override? - Feature Requests - CHDK Forum
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Aperture Limit Override?

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Offline Woodsman

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Aperture Limit Override?
« on: 27 / November / 2007, 10:58:03 »
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« Last Edit: 22 / April / 2008, 18:59:47 by Woodsman »
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Offline Mr Cat

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Re: Aperture Limit Override?
« Reply #1 on: 05 / December / 2007, 16:56:01 »
Ewavr make this in new version 161
we can override aperture to 9..10..11
http://ewavr.nm.ru/hdk/for_test/
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Offline ewavr

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Re: Aperture Limit Override?
« Reply #2 on: 05 / December / 2007, 18:19:44 »
It seems, that big Av works only on long end of zoom.  :( 
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Offline barberofcivil

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Re: Aperture Limit Override?
« Reply #3 on: 06 / December / 2007, 11:12:09 »
Quote from: Mr Cat on 05 / December / 2007, 16:56:01
Ewavr make this in new version 161
we can override aperture to 9..10..11
http://ewavr.nm.ru/hdk/for_test/


I had a try at these and they seem to work (A570).  The interesting thing is that the increased AV values are recorded in the exif data (as opposed to the shutter overrides, which aren't).  Was this able to be accomplished by Ewavr, or are those apertures built in to the camera and just disabled depending on the make?
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Offline barberofcivil

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Re: Aperture Limit Override?
« Reply #4 on: 06 / December / 2007, 19:30:14 »
Quote from: Barney Fife on 06 / December / 2007, 18:47:08
Quote from: barberofcivil on 06 / December / 2007, 11:12:09
I had a try at these and they seem to work (A570).  The interesting thing is that the increased AV values are recorded in the exif data (as opposed to the shutter overrides, which aren't).  Was this able to be accomplished by Ewavr, or are those apertures built in to the camera and just disabled depending on the make?

It appears that any override settings that go beyond what you can select on the camera's own controls, will not get recorded properly in EXIF info. Considering that even Canon can't put the ISO value in the right place in EXIF info, I'm not too concerned. With all the amazing new features, EXIF recording is minor (to me at least). If I have to use any special settings I will most likely remember them, or use the audio-note to just say a few words to remind myself.

Sure, would be nice if the right EXIF info was recorded. But if I had to choose between the right EXIF data and all the new features? I'd ditch the EXIF in a heartbeat! :D

I know this, that is why I was surprised to see the extended AV recorded (camera max is 8.0 but 11.0 was shown), on the playback display anyways.  Didn't check the actual exif, but I thought that's where the playback info gets read from.
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Offline emu

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Re: Aperture Limit Override?
« Reply #5 on: 07 / December / 2007, 11:27:35 »
Quote from: Barney Fife on 06 / December / 2007, 18:47:08
Quote from: barberofcivil on 06 / December / 2007, 11:12:09
I had a try at these and they seem to work (A570).  The interesting thing is that the increased AV values are recorded in the exif data (as opposed to the shutter overrides, which aren't).  Was this able to be accomplished by Ewavr, or are those apertures built in to the camera and just disabled depending on the make?

It appears that any override settings that go beyond what you can select on the camera's own controls, will not get recorded properly in EXIF info. Considering that even Canon can't put the ISO value in the right place in EXIF info, I'm not too concerned. With all the amazing new features, EXIF recording is minor (to me at least). If I have to use any special settings I will most likely remember them, or use the audio-note to just say a few words to remind myself.

Sure, would be nice if the right EXIF info was recorded. But if I had to choose between the right EXIF data and all the new features? I'd ditch the EXIF in a heartbeat! :D







I think if we give Irfan from IrfanView examples of pics with the info which pic has which ISO and which AV value HE might be able to do it... but I don't know if he wants to  ::)
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Offline barberofcivil

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Re: Aperture Limit Override?
« Reply #6 on: 07 / December / 2007, 14:18:15 »
I've been testing this on both my A570 and S2 (ewavr build).

On the A570, the higher apertures work, not only that, they are displayed on the LCD at half_shoot and saved to the exif.  Interestingly, when using the higher apertures, the shutter speed also gets reduced to a max of 1/500 (however, I'm sure the shutter overrides would bypass this, but ewavr's build doesn't have them, may have to try scripting them).

On the S2, I can set the higher apertures, but they seem to have no effect (both ewavr and allbest).

What this seems to me is that they aren't really overrides in the same way the shutter overrides are, in the A570 (and probably other models) the higher apertures are actually built into the Canon software, but they are not available to the user for some reason (maybe they are enabled on some higher end models), however, ewavr's build is able to control them, whereas for the S2 they are not part of the software, so are not available at all.  This is indicated by the fact that the higher apertures are both used and actually displayed (and exif) by the camera and also limit the shutter speed.

Does anyone have a camera that the AllBest actually acheives the higher apertures on?  Does this get written to the exif?

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Offline barberofcivil

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Re: Aperture Limit Override?
« Reply #7 on: 07 / December / 2007, 15:00:28 »
Quote from: Barney Fife on 07 / December / 2007, 14:41:02
Quote from: barberofcivil on 07 / December / 2007, 14:18:15
Does anyone have a camera that the AllBest actually acheives the higher apertures on?  Does this get written to the exif?

Interestingly, on the S3 the aperture value is not displayed in the EVF nor in review info. So I doubt it's even being recorded in EXIF. It only shows max 8.0. The calculated f-stop does show however, but not the true f-stop being used. That only temporarily shows up in the Misc info stuff under Av, but not after a half-press, only after the exposure has been taken.

But is it being used?  Are the exposures different from a max Av exposure.  On my S2 I can set the overrides and they appear in the Misc info, but the exposures are identical to Av 8.0, the overriding does not seem to be applied or doesn't work for it.
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Offline barberofcivil

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Re: Aperture Limit Override?
« Reply #8 on: 07 / December / 2007, 15:18:54 »
Quote from: Barney Fife on 07 / December / 2007, 15:13:19
Yes, they are being used. I can compare the resulting image brightness to tell the difference between f/11 and f/8.0. The max I get is something like f/10.8 in the Av calculation (from memory). Much depends on what mode you are using the camera in. It'll take some learning to get used to when they do and don't work. Testing them all at max zoom helps so they are all available.

(see note above from GrAnd about them being only available at longer zoom settings)


I'll have to try the zoom.
This still doesn't answer why the exif is there for them on the A570 as if they are built-in settings.
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Offline barberofcivil

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Re: Aperture Limit Override?
« Reply #9 on: 07 / December / 2007, 15:28:50 »
Quote from: barberofcivil on 07 / December / 2007, 15:18:54
Quote from: Barney Fife on 07 / December / 2007, 15:13:19
Yes, they are being used. I can compare the resulting image brightness to tell the difference between f/11 and f/8.0. The max I get is something like f/10.8 in the Av calculation (from memory). Much depends on what mode you are using the camera in. It'll take some learning to get used to when they do and don't work. Testing them all at max zoom helps so they are all available.

(see note above from GrAnd about them being only available at longer zoom settings)


I'll have to try the zoom.
This still doesn't answer why the exif is there for them on the A570 as if they are built-in settings.
No, doesn't seem to work on either ewavr or allbest on my S2.  On the A570 (ewavr only) it seems to work regardless of zoom.
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