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calculating exposure


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#1 Craig Agee

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Posted 21 March 2006 - 01:12 AM

my minolta auto meter VF in cine mode gives a reading for a 180degree shutter angle...my k3 has a shutter angle of 150(so ive been told correct me if im wrong please) how do i calculate this?
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#2 David Mullen ASC

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Posted 21 March 2006 - 01:27 AM

my minolta auto meter VF in cine mode gives a reading for a 180degree shutter angle...my k3 has a shutter angle of 150(so ive been told correct me if im wrong please) how do i calculate this?


Well, you could just open up another 1/3 of a stop to compensate, or change the ASA rating a third of a stop slower to roughly compensate for the difference between 180 and 150. Or you could calculate with the actual shutter speed would be at 24 fps. My quick math makes it out to be 1/57.6 instead of 1/48th, so you could use 1/60th in your light meter instead of 1/48th.
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#3 Craig Agee

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Posted 21 March 2006 - 01:30 AM

thanks david you the man
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