IXUS 100 IS (Europe) / PowerShot SD780 IS - Porting Thread - page 48 - General Discussion and Assistance - CHDK Forum

IXUS 100 IS (Europe) / PowerShot SD780 IS - Porting Thread

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Re: IXUS 100 IS (Europe) / PowerShot SD780 IS - Porting Thread
« Reply #470 on: 09 / April / 2010, 13:09:48 »
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I have asked an SDM user to test it.

I cannot remember if the indicated 'aperture' changes when you half-press.

Of course, you have to be overriding in the opposite sense to what the Canon firmware intends to do.

Indoors, that will mean forcing the ND in, outdoors in bright light that means forcing it out.

Re: IXUS 100 IS (Europe) / PowerShot SD780 IS - Porting Thread
« Reply #471 on: 09 / April / 2010, 13:17:45 »
I'm hoping that there a combination of settings that will persuade the camera to select a faster shutter automatically eg 1/640 f3.2 instead of the standard 1/80 f9, but maybe that's not possible

Re: IXUS 100 IS (Europe) / PowerShot SD780 IS - Porting Thread
« Reply #472 on: 09 / April / 2010, 13:21:48 »
I'm hoping that there a combination of settings that will persuade the camera to select a faster shutter automatically eg 1/640 f3.2 instead of the standard 1/80 f9, but maybe that's not possible

It is not only possible, it is the 'ND constant exposure' option in SDM's Bracketing/Overrides menu.

It is used by kite aerial photographers to force a shutter speed 8x faster than 'normal'.


David

Re: IXUS 100 IS (Europe) / PowerShot SD780 IS - Porting Thread
« Reply #473 on: 09 / April / 2010, 13:44:32 »
If this is a question about the sd780 running SDM please move the discussion to the SDM subforum.

Thanks,
Harpo
Canon Models - SD300, SD780, & SX210


Re: IXUS 100 IS (Europe) / PowerShot SD780 IS - Porting Thread
« Reply #474 on: 09 / April / 2010, 13:51:41 »
I think you misunderstand.

I am trying to help a CHDK user who cannot get the ND override to work.
By asking one of my SDM IXUS100 users to test ND override we will at least know if the firmware address of the function is correct.

Re: IXUS 100 IS (Europe) / PowerShot SD780 IS - Porting Thread
« Reply #475 on: 09 / April / 2010, 14:06:20 »
I think you misunderstand.

I am trying to help a CHDK user who cannot get the ND override to work.
By asking one of my SDM IXUS100 users to test ND override we will at least know if the firmware address of the function is correct.

Many thanks for your help.  Is what I'm I'm looking for - forcing a faster shutter speed by keeping the ND filter out - a function in SDM rather than CHDK? If so I should try SDM

Re: IXUS 100 IS (Europe) / PowerShot SD780 IS - Porting Thread
« Reply #476 on: 09 / April / 2010, 14:16:24 »
@ap1414 - I don't think it's strictly a SDM function but it does appear that his build might have it at present.  They are seperate builds however.  So if there is an issue on the sd780 build I can certainly try to fix it.  However if your using the SD780 SDM build only Microfunguy can likely help you. 

I try to keep my sd780 port thread clean if I can.   Certainly if you find a bug in the non-SDM build here is the place to complain about it.

Harpo
Canon Models - SD300, SD780, & SX210

Re: IXUS 100 IS (Europe) / PowerShot SD780 IS - Porting Thread
« Reply #477 on: 09 / April / 2010, 14:19:29 »
With CHDK, you should be able to force the ND filter out only if the Canon firmware intended to force it in, as it would in bright light outdoors.

CHDK does not change the shutter-speed to compensate so the exposure would be incorrect.

In fact, CHDK does not test what the Canon firmware intends to do first.

Anyway, let us wait until I get a reply from the tester.


David


Re: IXUS 100 IS (Europe) / PowerShot SD780 IS - Porting Thread
« Reply #478 on: 09 / April / 2010, 14:21:41 »
@Microfunguy - The ND override works as I detail in a post above yours. http://chdk.setepontos.com/index.php/topic,3995.msg48448.html#msg48448.   Everytime you mention SDM in this thread it muddies the support of the sd780 port build that is not SDM.   So I would greatly appreciate it if when you answer questions you don't give SDM details like

Quote
"It is not only possible, it is the 'ND constant exposure' option in SDM's Bracketing/Overrides menu."

Thanks,
Harpo
Canon Models - SD300, SD780, & SX210

Re: IXUS 100 IS (Europe) / PowerShot SD780 IS - Porting Thread
« Reply #479 on: 09 / April / 2010, 15:00:23 »
So, when ap414 says:-

 "I'm hoping that there a combination of settings that will persuade the camera to select a faster shutter automatically eg 1/640 f3.2 instead of the standard 1/80 f9, but maybe that's not possible"

You want me to say "that is not possible with CHDK"  rather than "that is not possible with CHDK but is supported by SDM"  ?

Notice that ap414 is requiring a constant-exposure mode.

1/80 @ f9 is equivalent to 1/640 @ f3.2.

 

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