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Canon PowerShot A1200

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Offline photongraph

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Re: Canon PowerShot A1200
« Reply #110 on: 05 / November / 2012, 00:03:30 »
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Tested the  a1200-100b-1.1.0-full on my cam on miniature mode I stopped it after 34 minutes. I'm sure it would have gone much longer, as the file size in miniature mode is very small. CCD temp reached 54C (ambient was at 30C). The "sensor may overheat" warning displayed only once. My LSD Ni-Mh battery got quite warm.


Thanks WW!
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Offline waterwingz

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Re: Canon PowerShot A1200
« Reply #111 on: 05 / November / 2012, 10:02:13 »
Quote from: photongraph on 05 / November / 2012, 00:03:30
Tested the  a1200-100b-1.1.0-full on my cam on miniature mode I stopped it after 34 minutes.
AFAIK,  miniature mode was not restricted by the HD time limit so would normally record longer anyway.
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline photongraph

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Re: Canon PowerShot A1200
« Reply #112 on: 05 / November / 2012, 13:16:19 »
Yes it is, I've used miniature mode dozens of times to its time limit 9min 59sec to 10min. Well at least it is in my a1200 with 100b firmware. Maybe its different in the other firmware versions?
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Offline waterwingz

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Re: Canon PowerShot A1200
« Reply #113 on: 05 / November / 2012, 15:13:49 »
Quote from: photongraph on 05 / November / 2012, 13:16:19
Yes it is, I've used miniature mode dozens of times to its time limit 9min 59sec to 10min.
I stand corrected.
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline waterwingz

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Re: Canon PowerShot A1200 - don't use Servo AF mode
« Reply #114 on: 05 / January / 2013, 18:56:48 »
A quick note in case someone else comes across this problem on their A1200.

When using manual exposure overrides,  or when using the USB bracketing mode,  you need to go into Canon's shooting menu and disable the "Servo AF" function.    If you leave it enabled,  it will reset your shooting overrides each time it refocuses, causing the override to reset.

This probably applies to other camera as well.




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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline patcoyles

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Re: Canon PowerShot A1200
« Reply #115 on: 17 / January / 2013, 01:27:56 »
Quote from: waterwingz on 09 / September / 2012, 18:10:09
Quote from: patcoyles on 09 / September / 2012, 17:08:17
Thanks again, I had it in <alt> mode, oops. Operator error is often my snag. Now I'm getting photos.
See: http://flic.kr/p/d8U7cs
Let us know how well the sync works with the camera ?

Waterwingz, Update:I'm running into a problem using usb remote with a pair of A1200s, one modified to shoot IR. The Remote parameters are set: Enable Remote, on; Switch Type, OnePush; Control Mode, Normal; Enable Synch, on. I have a timer circuit that makes the 5v circuit, currently set for every 4 sec, so takes image every 8 sec. However, the cameras are not triggering in synch, looks like one is a pulse off. I used similar setup (but older CHDK) with A490/495 pair. Sometimes ran into same problem, but got to work, not sure how. See processed result at:
http://mapknitter.org/map/view/ewb-regional-cal-poly-ndvi
I'm looking for troubleshooting help and a reliable startup/turn on sequence so can reliably get the cameras to shoot together. Thanks, Pat
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Offline waterwingz

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Re: Canon PowerShot A1200
« Reply #116 on: 17 / January / 2013, 08:28:58 »
Quote from: patcoyles on 17 / January / 2013, 01:27:56
Waterwingz, Update:I'm running into a problem using usb remote with a pair of A1200s, one modified to shoot IR. The Remote parameters are set: Enable Remote, on; Switch Type, OnePush; Control Mode, Normal; Enable Synch, on.
Sounds about right.

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I have a timer circuit that makes the 5v circuit, currently set for every 4 sec, so takes image every 8 sec.
So its a square wave - 5V on for 4 seconds,  0V for the other 4 seconds ? Any way to make that 5V for 6 seconds, 0v for 2 seconds ? (see below)

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However, the cameras are not triggering in synch, looks like one is a pulse off. I used similar setup (but older CHDK) with A490/495 pair. Sometimes ran into same problem, but got to work, not sure how. See processed result at:
http://mapknitter.org/map/view/ewb-regional-cal-poly-ndvi
I think that the most likely issue here is focus lock.  If the camera does not successfully get focus  (&exposure) lock during the 4 second half press,  it may not take a picture when the 5V is removed.    This is an aerial application and your timer circuit allows just 4 seconds for the camera to lock focus for each shot.  Also,  I have no idea if the IR mod makes this even more difficult ? 

So first of all,  make absolutely sure you have the Canon focus mechanism setup correctly.  You definitely need "Servo AF" turned OFF!  Its probably also a good idea to set AF Frame to Normal and AF Frame Size to Small. This could explain how you got things to work in the past.

If that doesn't clean things up,  you can use a script to set the focus and lock it a few seconds into your fllght.  You can then operate the shutter under script control (with AE lock as well) on the falling edge of the USB signal - but I'll need to check the code to make sure the "sync" function still works.   Alternately, it might be possible to have the script issue an "Exit Alt" command to allow normal timed shooting to continue - I need to look into that too to make sure focus stays locked in that mode.

You can also set focus lock manually with the Canon buttons.  Point the camera(s) off into the distance and press the "left/flower" button after first "half pressing & holding" the shutter release button.  You will see the letter AFL appear in yellow on the Canon OSD if you do it right.

If you can change the power pulse duty cycle as mentioned above, that could help too.

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I'm looking for troubleshooting help and a reliable startup/turn on sequence so can reliably get the cameras to shoot together.
Why are you thinking this is a startup/turn on sequence issue?  Are you just guessing that the sync problem is always with the first shot or can you tell that for sure from the pixs?   If so,  it might still be a focus problem, but it might be something different I guess.
« Last Edit: 17 / January / 2013, 09:36:04 by waterwingz »
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline patcoyles

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Re: Canon PowerShot A1200
« Reply #117 on: 18 / January / 2013, 00:21:49 »
Thanks, I'll try the tips and report back. With the present set up I can't customize the pulse. I need to double check, but seems like the pair starts shooting out of synch.
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Offline nafraf

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Re: Canon PowerShot A1200
« Reply #118 on: 04 / July / 2013, 20:37:57 »
Untested patch to mute mic if zoom during video recording.
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Offline waterwingz

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Re: Canon PowerShot A1200
« Reply #119 on: 05 / July / 2013, 11:35:29 »
Quote from: nafraf on 04 / July / 2013, 20:37:57
Untested patch to mute mic if zoom during video recording.
Patched & built successfully on both stable & dev trunks.   Loaded firmware on my A1200 1.00C

Switched to video mode, started "filming", and ran the mechanical zoom end to end a couple of times.  With both versions the high pitch buzz of the zoom motor was very audible in the resulting recording.   So I don't think this did what you intended.

But thank you for taking this on - I'm open to trying anything else you suggest.
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Ported :   A1200    SD940   G10    Powershot N    G16
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