SX400IS porting thread

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Offline srsa_4c

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Re: SX400IS porting thread
« Reply #50 on: 21 / July / 2017, 11:27:09 »
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Hi everyone, please what button i have to press in order to make work CHDK in my camera. I put the two files in SD but when i turn on the camera it does not work, help me please.
Once you succeeded installing and see the CHDK splash screen, you can enter (and leave) ALT mode by momentarily pressing the playback button.

To install, you can use STICK (Win/Linux/Mac), or CHIMP if you're using Windows.

If your firmware version is not supported, read the following page (and its links) carefully: http://chdk.wikia.com/wiki/Canon_Basic/Scripts/Dumper and make a dump.

Re: SX400IS porting thread
« Reply #51 on: 29 / October / 2017, 21:11:26 »
Hello, thank you so much for this port, it is the only reason I am using this camera right now. However, there seems to be one problem with it. There is no aperture override settings, even though I believe this camera has an adjustable aperture. In addition, there are many settings for an ND filter, even though this camera does not have an ND filter I believe. Thanks so much

Re: SX400IS porting thread
« Reply #52 on: 29 / October / 2017, 23:25:09 »
There is no aperture override settings, even though I believe this camera has an adjustable aperture.
Sorry, but looking at the specs on dpreview it appears your camera does not have an adjustable aperture.  The reported f-stop value will change with zoom position but that's different.
Ported :   A1200    SD940   G10    Powershot N    G16

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Offline reyalp

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Re: SX400IS porting thread
« Reply #53 on: 30 / October / 2017, 00:14:40 »
Sorry, but looking at the specs on dpreview it appears your camera does not have an adjustable aperture.  The reported f-stop value will change with zoom position but that's different.
This may not be correct, the very similar sx410 apparently does,despite not exposing an it in the Canon UI https://chdk.setepontos.com/index.php?topic=12948.msg129634#msg129634

If that's the case, the defines aren't set up correctly in platform_camera.h
Don't forget what the H stands for.


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Offline blackhole

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Re: SX400IS porting thread
« Reply #54 on: 30 / October / 2017, 04:11:25 »
Sorry, but looking at the specs on dpreview it appears your camera does not have an adjustable aperture.  The reported f-stop value will change with zoom position but that's different.
This may not be correct, the very similar sx410 apparently does,despite not exposing an it in the Canon UI https://chdk.setepontos.com/index.php?topic=12948.msg129634#msg129634

If that's the case, the defines aren't set up correctly in platform_camera.h
It may be true, but I think the nafraf had a camera for at least a while,during development.

@arnoldsdad
What happens if you use ND filter from the CHDK menu (Enhanced Photo Operations> ND filter state)?
If you set the zoom to about one quarter, you will see changing the width of the aperture when you press the shutter button halfway. Provided the camera has an iris diaphragm.
Watch the video how it looks.
https://chdk.setepontos.com/index.php?topic=12948.msg129671#msg129671

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Offline reyalp

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Re: SX400IS porting thread
« Reply #55 on: 03 / September / 2018, 00:31:54 »
If any sx400 owners are able to help (ping @arnoldsdad @JackZ @Yiori @Gri128 @rjmusto @chirila.alexandru) I'd like to resolve the iris vs ND issue discussed above.

Attached are an sx400 build with iris control enabled, and a test script to run with this build.

To test:
* Put the camera on a stable surface or tripod
* Aim at a scene that doesn't have anything moving or changing lighting. A wall is fine.
* Set the camera to P mode, flash disabled, manual ISO
* Run the script with the default options

The script should take several shots (probably around 10), and create a file called avtest.csv in the root of the SD card. Post the file here.

Thanks in advance

edit 06:47 GMT 9/3:
Updated script to fix an error if the initial camera chosen Av was different from script min av
« Last Edit: 03 / September / 2018, 02:48:53 by reyalp »
Don't forget what the H stands for.

Re: SX400IS porting thread
« Reply #56 on: 09 / November / 2018, 18:35:18 »
Hi @reyalp,
Sorry for the really late reply. Here is the file, I tested on my wall at home

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Offline reyalp

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Re: SX400IS porting thread
« Reply #57 on: 10 / November / 2018, 01:29:06 »
Hi @reyalp,
Sorry for the really late reply. Here is the file, I tested on my wall at home
@arnoldsdad
Thanks for testing. That confirms the sx400 has an adjustable aperture, as expected. Trunk (1.5) autobuild 5116 and later are set to have aperture controls in CHDK rather than ND.

While working on this, I noticed this camera also probably suffers from an issue blackhole reported on sx410. If you can test with the attached build, that would be helpful.

To test, under "Enhanced Photo Operations"->"Bracketing in Continuous Mode"
set AV Bracketing to 2/3
set bracketing type to +/-
Set the camera to continuous shooting in the Canon UI.

Shoot a burst of 3 or more shots.
The camera shouldn't crash, and at least some of the shots should have different exposure. (If the camera started with the aperture full open or full close, either the + or - shots will all be the same)
Don't forget what the H stands for.


Re: SX400IS porting thread
« Reply #58 on: 10 / November / 2018, 11:44:49 »
Hi  @reyalp,

As you suspected, the four images had different exposures.

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Offline reyalp

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Re: SX400IS porting thread
« Reply #59 on: 10 / November / 2018, 17:15:13 »
As you suspected, the four images had different exposures.
Thanks for confirming. The change to support av bracketing is in autobuild 5118 and later
Don't forget what the H stands for.

 

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