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Shutter Override confusion - Allbest Build 49 - Canon 720is

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Offline psachs

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Shutter Override confusion - Allbest Build 49 - Canon 720is
« on: 05 / April / 2008, 12:25:19 »
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First off, excellent job on this build.  However, I am trying to do some high speed photography and cannot for the life of me figure out how to properly set the Shutter override using Allbest Build 49. 

I have already reviewed the "Override shutter speed value" section at CHDK firmware usage/AllBest - CHDK Wiki, but I cannot do what the instructions state.  They state:

Value factor = OFF, 1/100K, 1/10000, 1/1000, 1/100, 1/10, 1, 10, 100

The only choices I see for Value Factor are OFF and 1.

So, I'm stumped.  Was there a change to the "Value factor" choices in Build 49 that are not yet documented?

Any assistance would be appreciated.

Thanks,

Peter
« Last Edit: 05 / April / 2008, 12:48:09 by psachs »
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Offline PhyrePhoX

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Re: Shutter Override confusion - Allbest Build 49 - Canon 720is
« Reply #1 on: 05 / April / 2008, 13:17:44 »
change "shutter speed enum type" to factor.
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Offline psachs

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Re: Shutter Override confusion - Allbest Build 49 - Canon 720is
« Reply #2 on: 05 / April / 2008, 13:30:04 »
Thank you.  That did it.  But I chose EV Step because it describes the two choices as:

  • EV Step -- Shutter speed selection, by 1/3EV steps (the standard shutter selection). Eg: 1/2" (second), 1/1600", etc. Most people will probably choose this famililar 1/3EV step method.

  • Factor --- Select shutter-speeds by decimal equivalents. (Extremely valuable for analytic and research photography needs.)

Since I'm not doing analytic or research photography, I chose EV Step.   So I guess I would have to do a mathematical calculation each time I want to use a high-speed shutter speed.  Oh well, it's a nice feature I guess if you don't mind doing math before you shoot.  I'll pass until there's a Build that just allows you to set a standard fraction.

Thanks for the answer though.
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Offline PhyrePhoX

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Re: Shutter Override confusion - Allbest Build 49 - Canon 720is
« Reply #3 on: 05 / April / 2008, 13:34:16 »
ev step does just that - standard fractions. the factor in this case is just an on/off switch.
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Offline psachs

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Re: Shutter Override confusion - Allbest Build 49 - Canon 720is
« Reply #4 on: 05 / April / 2008, 13:43:17 »
Then the instructions at CHDK firmware usage/AllBest - CHDK Wiki seem to make no sense, or I'm an idiot. (which is entirely possible :))

It says: 

Example: If you wish to use a shutter speed of 1/50,000th of a second shutter speed, you select an Override Shutter Speed Value of 2, and a Value Factor of 1/100K. (2/100,000 = 1/50,000)

So, according to these instructions, I have to calculate the speed I want to use by setting Override Shutter Speed to something other than 1/50,000.  Namely, I have to set Override Shutter Speed to "2" and Value Factor to "1/100k."  And I can only set the Value Factor to something other than OFF or 1, if I set enum type to Factor.
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Offline Barney Fife

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Re: Shutter Override confusion - Allbest Build 49 - Canon 720is
« Reply #5 on: 05 / April / 2008, 17:46:18 »
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« Last Edit: 22 / April / 2008, 16:21:24 by Barney Fife »
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