A550 issues - General Discussion and Assistance - CHDK Forum

A550 issues

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A550 issues
« on: 03 / January / 2009, 08:06:57 »
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I recently installed CHDK on my A550 camera. I want to use it with my telescope to take multiple exposures through the eyepiece while focused at infinity.

I go to the Canon menu, choose LANDSCAPE and MULTIPLE EXPOSURES. Then when I switch to the ALT menu to run a continuous script, it switches the camera to AUTO mode. If I start out in MANUAL mode and MULTIPLE EXPOSURES and switch to the ALT menu, it stays in th MANUAL mode.

Is there a way to tell the camera to focus to infinity in a script?

I tried making a USB remote, using 2 AAA batteries but it doesn't work. Is the voltage needed happen to be over 3 volts?

Sorry for the simple questions....


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Offline Hacki

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Re: A550 issues
« Reply #1 on: 03 / January / 2009, 08:14:42 »
Code: [Select]
set_focus 65536
Should set the focus to infinity. Does only work in manual focus mode. You could also have a look at the SD override in the "Extra Photo Operations" menu. (SD override = subject distance override. set it to 65536 and the cam will always focus to infinity)


edit:

Quote
I tried making a USB remote, using 2 AAA batteries but it doesn't work. Is the voltage needed happen to be over 3 volts?

Yep. Most cameras need 3.6V, some need 4V - look here: CameraFeatures - CHDK Wiki
« Last Edit: 03 / January / 2009, 08:16:39 by Hacki »

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Offline fe50

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Re: A550 issues
« Reply #2 on: 03 / January / 2009, 08:17:31 »
Hello & welcome darwin-t !

I tried making a USB remote, using 2 AAA batteries but it doesn't work. Is the voltage needed happen to be over 3 volts?

The A550 needs at least 3.8 V, see Camera Features.

Re: A550 issues
« Reply #3 on: 03 / January / 2009, 10:21:33 »
Thank you both! That solved both of my problems.


Re: A550 issues
« Reply #4 on: 03 / January / 2009, 11:58:59 »
After testing I see that I still don't have it.

I inserted the focus command into the script different places - after wait_click, after sleep_1000 and where it currently is and the camera refocuses between shots.

@title Continuous Shoot
@param a None
@default a 0
@param b None
@default b 0
@param c None
@default c 0

print "Press SET to start"
wait_click
rem set_tv 0
press "shoot_half"
sleep 1000
press "shoot_full"
print "Press SET to stop"
set_focus 65536
wait_click
release "shoot_full"
release "shoot_half"

end

I also set the distance override to 65535 with a factor of 1000 and it STILL refocuses each shot in continuous mode.

Is the shoot_half the problem? Is it needed in the loop?



I modified my remote switch to 4.5v, set "Enable remote" and it still doesn't trip the shutter. Am I missing something here?

Oh, I found AF Lock which can be usd in Manual mode. It locks the focus even for repeated shots, but not in continuous mode, evidently. It may be a hopeless cause with this camera.
« Last Edit: 03 / January / 2009, 12:43:00 by darwin-t »

 

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