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Fairly straight forward question but I'm having a tad of trouble with exposure on this one.
In a studio environment with a key and fill light (both 500 watt monoblocks) I have key light set at f5.6 after taking a flash meter reading for given shutter speed of 1/160th second.
I put in fill light and, in this instance, I want the ratio to be the same i.e. f5.6 also. So both heads are set to half power and are at the same 45 degree axis either side of camera and both giving a reading (when taken individually while the other is turned off) of f5.6.
So, individually they both give a flash meter reading of f5.6, but when they are both turned on at the same time and I take a reading from the centre of the subjects face I get f8, which stands to reason as some of the light from each will be spilling onto the other side of the face also.
So, what f-stop should I be setting the camera to? If, I were to have the fill light set to take a flash reading of f2.8 i.e. two stops lower then the key at f5.6, I'd be setting the camera to f5.6, right? So that would suggest that both heads set to f5.6 would also suggest that I set the camera to f5.6, correct?
I'm asking as if I set camera to f8, the reading I get when both flashes fire into the flash meter, the images seem about a stop or so under exposed. At F5.6 they seem about half a stop over.
What's the school of thought on this, with two lights set at the same distance at the same power and both, individually, give f5.6, but both together give f8, what f-stop do I set camera to?
In a studio environment with a key and fill light (both 500 watt monoblocks) I have key light set at f5.6 after taking a flash meter reading for given shutter speed of 1/160th second.
I put in fill light and, in this instance, I want the ratio to be the same i.e. f5.6 also. So both heads are set to half power and are at the same 45 degree axis either side of camera and both giving a reading (when taken individually while the other is turned off) of f5.6.
So, individually they both give a flash meter reading of f5.6, but when they are both turned on at the same time and I take a reading from the centre of the subjects face I get f8, which stands to reason as some of the light from each will be spilling onto the other side of the face also.
So, what f-stop should I be setting the camera to? If, I were to have the fill light set to take a flash reading of f2.8 i.e. two stops lower then the key at f5.6, I'd be setting the camera to f5.6, right? So that would suggest that both heads set to f5.6 would also suggest that I set the camera to f5.6, correct?
I'm asking as if I set camera to f8, the reading I get when both flashes fire into the flash meter, the images seem about a stop or so under exposed. At F5.6 they seem about half a stop over.
What's the school of thought on this, with two lights set at the same distance at the same power and both, individually, give f5.6, but both together give f8, what f-stop do I set camera to?