FEC - Flash Exposure Compensation - Feature Requests - CHDK Forum
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FEC - Flash Exposure Compensation

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Offline eliavecellio

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FEC - Flash Exposure Compensation
« on: 14 / January / 2008, 11:10:43 »
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It has been indirectly mentioned before (Flash Output Override), but thought I would rephrase this feature request using the standard terminology of Flash Exposure Compensation.

That is, the ability to either throttle down the flash power output or increase it above what the camera would have chosen for a particular shot.

Elia
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Offline bakachu

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Re: FEC - Flash Exposure Compensation
« Reply #1 on: 14 / September / 2008, 07:30:22 »
I too would be very keen for such a feature
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Offline fudgey

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Re: FEC - Flash Exposure Compensation
« Reply #2 on: 14 / September / 2008, 10:09:41 »
Flash exposure compensation is readily available in P, Av, Tv modes in my a570is and obviously many others (Canon feature). In other models it's likely accessible via the Digic III propcase 127 or Digic II propcase 28 (see PropertyCase - CHDK Wiki).

This means you can already write a script to do this:

Code: [Select]
rem Change flash exposure compensation setting in full Ev steps.
rem Digic III propset version, replace 127 with 28 for Digic II propset cameras.
@title FlashEVComp
@param a Flash Comp (Ev)
@default 0
a=a*96
get_prop 127 P
print "Old:",P
P=P+a
set_prop 127 P
print "New:",P
end

And no, I didn't try that script. Also, for completeness input should preferably be sanitized and prop 121 (15 in DigicII) tested.

If you need it to be more ergonomic, you should try to think of a good way to access it. Something buried deep in extra photo operations that you can pick and place to your custom user menu is probably the quickest way to improve usability.
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