CHDK for the G10 : Beta Testing :

waterwingz

11913

Re: CHDK for the G10 : Beta Testing :

« Reply #120 on: 19 / December / 2011, 15:14:12 »

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Quote from: rocket187um on 19 / December / 2011, 14:58:50

Is there a bulb feature included?

If I understand the definition of "bulb" correctly, you want to be able to open the shutter with the press of the shutter button and have it stay open until you release that button ?

So far as I know, its not possible to control the shutter directly with CHDK. But you can set quite long shutter speeds so the lens stays open a long time. This is lame but I guess you could try that and then place a dark card in front of the lens when you wished to cut off the exposure manually ?

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Ported : A1200 SD940 G10 Powershot N G16

philmoz

3124

Re: CHDK for the G10 : Beta Testing :

« Reply #121 on: 19 / December / 2011, 16:51:10 »

Quote from: waterwingz on 19 / December / 2011, 15:14:12

Quote from: rocket187um on 19 / December / 2011, 14:58:50
Is there a bulb feature included?
If I understand the definition of "bulb" correctly, you want to be able to open the shutter with the press of the shutter button and have it stay open until you release that button ?

So far as I know, its not possible to control the shutter directly with CHDK. But you can set quite long shutter speeds so the lens stays open a long time. This is lame but I guess you could try that and then place a dark card in front of the lens when you wished to cut off the exposure manually ?

Easy enough to write a 'bulb' script - but it would have to use another button to activate and then close the shutter since the shutter button will start / stop the script.

Phil.

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CHDK ports:
sx30is (1.00c, 1.00h, 1.00l, 1.00n & 1.00p)
g12 (1.00c, 1.00e, 1.00f & 1.00g)
sx130is (1.01d & 1.01f)
ixus310hs (1.00a & 1.01a)
sx40hs (1.00d, 1.00g & 1.00i)
g1x (1.00e, 1.00f & 1.00g)
g5x (1.00c, 1.01a, 1.01b)

waterwingz

11913

Re: CHDK for the G10 : Beta Testing :

« Reply #122 on: 19 / December / 2011, 17:07:47 »

Quote from: philmoz on 19 / December / 2011, 16:51:10

Easy enough to write a 'bulb' script

I must be having a slow day - what script command would you use to open and close the shutter? Or maybe start and then cancel a long exposure on the fly?

Quote

- but it would have to use another button to activate and then close the shutter since the shutter button will start / stop the script.

Might be best to use the USB remote here anyway - so as not to jiggle the camera during the exposure.

Logged

Ported : A1200 SD940 G10 Powershot N G16

philmoz

3124

Re: CHDK for the G10 : Beta Testing :

« Reply #123 on: 19 / December / 2011, 17:16:05 »

Quote from: waterwingz on 19 / December / 2011, 17:07:47

Quote from: philmoz on 19 / December / 2011, 16:51:10
Easy enough to write a 'bulb' script
I must be having a slow day - what script command would you use to open and close the shutter? Or maybe start and then cancel a long exposure on the fly?

Quote
- but it would have to use another button to activate and then close the shutter since the shutter button will start / stop the script.
Might be best to use the USB remote here anyway - so as not to jiggle the camera during the exposure.

Code: [Select]

press "shoot_half"
press "shoot_full"

...
code to wait for another button or remote
...

release "shoot_full"
release "shoot_half"

Phil.

Logged

CHDK ports:
sx30is (1.00c, 1.00h, 1.00l, 1.00n & 1.00p)
g12 (1.00c, 1.00e, 1.00f & 1.00g)
sx130is (1.01d & 1.01f)
ixus310hs (1.00a & 1.01a)
sx40hs (1.00d, 1.00g & 1.00i)
g1x (1.00e, 1.00f & 1.00g)
g5x (1.00c, 1.01a, 1.01b)

waterwingz

11913

Re: CHDK for the G10 : Beta Testing :

« Reply #124 on: 19 / December / 2011, 17:22:50 »

Maybe I'm being a bit thick, but

Code: [Select]

press "shoot_half"
press "shoot_full"

just does the same thing as pushing the shutter button manually and holding it down. The camera takes a picture at the current exposure and ISO setting. It doesn't hold the shutter open while the button is pressed

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Ported : A1200 SD940 G10 Powershot N G16

philmoz

3124

Re: CHDK for the G10 : Beta Testing :

« Reply #125 on: 19 / December / 2011, 17:26:25 »

Quote from: waterwingz on 19 / December / 2011, 17:22:50

Maybe I'm being a bit thick, but
Code: [Select]
press "shoot_half" press "shoot_full"
just does the same thing as pushing the shutter button manually and holding it down. The camera takes a picture at the current exposure and ISO setting. It doesn't hold the shutter open while the button is pressed

My bad, I thought it worked the other way.
That's what happens when you reply to posts before the morning coffee

Phil.

Logged

CHDK ports:
sx30is (1.00c, 1.00h, 1.00l, 1.00n & 1.00p)
g12 (1.00c, 1.00e, 1.00f & 1.00g)
sx130is (1.01d & 1.01f)
ixus310hs (1.00a & 1.01a)
sx40hs (1.00d, 1.00g & 1.00i)
g1x (1.00e, 1.00f & 1.00g)
g5x (1.00c, 1.01a, 1.01b)

fudgey

1705
a570is

Re: CHDK for the G10 : Beta Testing :

« Reply #126 on: 08 / January / 2012, 08:46:09 »

Shutter can be controlled with native calls, see e.g.
http://chdk.setepontos.com/index.php?topic=4337.msg61346#msg61346

To simulate bulb mode you would set up a very long exposure and then toggle the shutter when you wish. You can't interrupt exposure, just close the shutter and a very long exposures often equal bad image quality due to amp glow and noise, so it's not ideal.

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