A Series (A550) ~ Exposure with ND Filter State and/or Fast EV - Hello, I'm a NEWBIE - HELP!! (Newbies assistance, User Guides and thank you notes) - CHDK Forum
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A Series (A550) ~ Exposure with ND Filter State and/or Fast EV

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Offline ReDcOX

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A Series (A550) ~ Exposure with ND Filter State and/or Fast EV
« on: 27 / January / 2010, 18:47:51 »
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Offline fudgey

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Re: A Series (A550) ~ Exposure with ND Filter State and/or Fast EV
« Reply #1 on: 30 / January / 2010, 09:27:59 »
I've never actually used this feature (my a570 has a separate button for exposure compensation), so I may be mistaken...but if I'm not, this Fast Ev feature works by writing to the Ev compensation propcase.

Canon user interface lets you modify it in range -2 to +2 Ev, but it will actually work in range -4 to +4 Ev when altered by CHDK (unless this has changed in more recent cameras).


If you force ND state to using CHDK, Canon's autoexposure will not become aware of this. Therefore it usually only makes sense to use ND filter override when you also manually set ISO and Tv (from Canon user interface or using CHDK overrides).
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Offline ReDcOX

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Re: A Series (A550) ~ Exposure with ND Filter State and/or Fast EV
« Reply #2 on: 30 / January / 2010, 10:51:37 »
Got it! Thank you for your reply and the information. (And your CHDK work / lightning script.)

~ Red
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