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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 19:37:14 +1100
> Now I don't just seem to get how the estimated 2nd curtain 
> with the OTF 
> metering can't be faster than  1/60 sec and thus exceed the 
> synch speed 
> if the camera doesn't know a flash is attached.  Say the flash is in 

Well the X-sync contact closes when the first curtain has fully opened, up
to this point the OTF metering is just reading the ambient light, which
would give an exposure >1/60 without flash, so the 2nd curtain hasn't
started to close when the flash fires.


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