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Re: [OM] Hep! Dr. Flash needs... um, flash help

Subject: Re: [OM] Hep! Dr. Flash needs... um, flash help
From: "Wayne Harridge" <wayneharridge@xxxxxxxxxxxxxxx>
Date: Mon, 29 Dec 2008 19:39:07 +1100
> 
> If the camera believes, at the start of exposure, that the 
> exposure time will be faster than 1/60 second the flash will 
> not be fired and the second curtain will be started on its 
> way before the first curtain is fully open.  If the camera 
> believes, at the start of exposure, that the exposure will be 
> 1/60 second or longer then it will wait for the first curtain 
> to be fully opened and the flash will be fired.  It takes the 
> first curtain 1/60 second to get across to the other side.  
> Even if the second curtain is released instantly the exposure 
> will be 1/60 second.  It can't be faster.   If the flash 
> doesn't fire or is underpowered then the camera (in auto 
> mode) can extend the shutter time.  But if the flash is 
> overpowered there's nothing that the camera can do.  Even if 
> it could move the shutter curtain faster it wouldn't help.  
> The exposure has already been made.
> 

Exactly !

...Wayne
 


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