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HIgh Shutter Speed?

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Offline lilewis

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HIgh Shutter Speed?
« on: 13 / September / 2008, 09:57:17 »
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Another noobie question..

After spending a few hours tinkering with it,  I think I understand the basics of CHDK, but after trying to shoot the Canon S2 IS at 1/100,00 it didn't seem to work - the camera shows 1/3,200 @ f2.7 

The CHDK pdf guide on pg 13 says: "Please note that the fastest speeds will only work under certain aperture settings and other special conditions."

Where can I find the relevant info that describes the aperture settings and special conditions?  Or even better.. if someone here can describe what  the settings need to be, I'd appreciate knowing.

Thanks
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Offline Microfunguy

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Re: HIgh Shutter Speed?
« Reply #1 on: 13 / September / 2008, 12:07:47 »
Quote from: lilewis on 13 / September / 2008, 09:57:17
after trying to shoot the Canon S2 IS at 1/100,00 it didn't seem to work - the camera shows 1/3,200 @ f2.7 

that is the maximum shutter-speed your camera normally works at.

That is the maximum value that will be displayed even when you set a faster override.

Try taking some actual test photos of a light bulb or other bright object to prove the shutter-speed really is getting faster.
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Offline fe50

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Re: HIgh Shutter Speed?
« Reply #2 on: 13 / September / 2008, 12:08:41 »
Hello & welcome lilewis !

Quote
the camera shows 1/3,200 @ f2.7 

That's the normal behaviour with CHDK: The Canon firmware don't know anything about the CHDK override settings...
The Canon-OSD of the camera always show the min. /max. available Canon-setting, the adjusted CHDK settings are shown only in the CHDK OSD in "Miscellaneous Values" which can be enabled/disabled in the CHDK menu ("Show Set Exposure Ev" in the "Miscellaneous Values" menu, disabled by default):


-> set "Show misc values" to "on half shoot" & check the values you want to see...

That's also the reason why the EXIF data of the CHDK-enhanced images doesn't contain the "real" override values...the high speed shutter overrides are working, check the resulting pictures...

The maximal possible settings are highly dependent from the camera model & the electrical / mechanical data, you can find some more informations in the CHDK wikia in Camera Features...
...and remember: for high speed shutter records you'll need 'tons of light' - use the flash !  ;)
*Edit: typos...
« Last Edit: 13 / September / 2008, 12:14:35 by fe50 »
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Offline lilewis

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Re: HIgh Shutter Speed?
« Reply #3 on: 13 / September / 2008, 14:17:48 »
Thanks for both of your quick replies. 
I understand and I guess it's time for me to do some experimenting now.
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