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Ultra Intervalometer Slows Down

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Ultra Intervalometer Slows Down
« on: 29 / May / 2010, 23:28:29 »
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Hi, I have an A480 with the latest autobuild version of CHDK. I'm using the Ultra Intervalometer from the wiki. I have the camera set to the highest resolution and review mode turned off. The Intervalometer is set to the default of 0.5 seconds.

It takes one shot every two seconds, which is what I expected, then after the 11th or 12th shot it clearly slows down to around four seconds per shot. Is that normal? What can I do to keep the interval consistent?

thanks, Andy

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Offline reyalp

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Re: Ultra Intervalometer Slows Down
« Reply #1 on: 29 / May / 2010, 23:46:55 »
It takes one shot every two seconds, which is what I expected, then after the 11th or 12th shot it clearly slows down to around four seconds per shot. Is that normal? What can I do to keep the interval consistent?
Without having looked at the script, I'd suggest that entering an impossible interval isn't a good idea. I wouldn't be at all surprised if that breaks something. Figure out what your camera can actually maintain and use something slightly more than that.

You can test this by using canons own continuous mode and holding the shutter down.

According to http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&tabact=ModelTechSpecsTabAct&fcategoryid=221&modelid=18155 your camera can do 0.8 FPS continuous. Almost all canon P&S can do the continuous rate indefinitely, assuming the card can keep up. Unlike many P&S, they generally don't do a few shots quick and then slow down when some buffer fills up. Your symptom sounds a bit like this, so it's possible the a480 is an exception, or something else is causing similar symptoms. Testing the built in continuous mode should help you figure this out.

edit:
The manual for your camera does say this about continuous shooting:
Quote
As the number of exposures increases, the shooting intervals may take longer.
« Last Edit: 29 / May / 2010, 23:50:04 by reyalp »
Don't forget what the H stands for.

Re: Ultra Intervalometer Slows Down
« Reply #2 on: 29 / May / 2010, 23:56:05 »
OK, I just did a quick test. 0.8 FPS seems to be about right and I took 60 continuous shots with no slow down.

I'm now looking at modifying a Lua script written for Digic II to see if that works better.

Andy

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Offline reyalp

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Re: Ultra Intervalometer Slows Down
« Reply #3 on: 30 / May / 2010, 00:19:08 »
OK, I just did a quick test. 0.8 FPS seems to be about right and I took 60 continuous shots with no slow down.

I'm now looking at modifying a Lua script written for Digic II to see if that works better.

Andy
I'd suggest trying ultra intervalometer with a 2 second or similar interval. If that works, try 1.5 etc.

Lua scripts that use propcase.lua should be pretty portable between propsets. If the script you are starting with uses hard coded propcase numbers, you might want to convert it.
Don't forget what the H stands for.


Re: Ultra Intervalometer Slows Down
« Reply #4 on: 30 / May / 2010, 01:48:35 »
This script works better:

http://chdk.wikia.com/wiki/LUA/Scripts:_Accurate_Intervalometer_with_power-saving_and_pre-focus

I edited the Wiki page to document the changes needed for the A480. Max speed is still around two seconds, but it appears to be constant.

Andy

 

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