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The way i meter is like this:
First, I set the lights in their places, say we're using just one. I place this light 45 degrees from the models face. Now, with a small box this will mostly just illuminate say the studio right side of her face.
Now, to meter, I would take a meter reading in the center of the studio right side of her face pointing towards the center of the box. Now, in a one light setup, this is mostly all you need. However, because this only shows you the brightest part of the face, the closest (and also focus) will be slightly darker. If you move the meter to their nose, still pointing towards the light, you'll see a slight difference. Depending on what I'm going for, typically I'll use the reading from the tip of the face.
Now, if you're in a two light setup, trying to make one side of the face darker than the other, I'll meter for the studio left and the studio right seperately facing towards each light respectively. This will give you your ratio. So if studio left is 1 stop darker, you have a 2:1 ratio. One side is twice as bright as the other.
Now, if you shoot metered to the darker side, then you'll blow out the bright side, but if you meter towards the bright side, you'll lose some detail in the darker side (if you were doing a 3:1 or a 4:1 ratio.) So what I do is then meter at the nose facing the camera. This will give you a mostly "overall" exposure with a decent balance. Now, this won't be 100% accurate either, and since we still want the bright side properly exposed, I'll then take the halfway point between the "overall" and the studio right (bright side) readings.
Numbers:
2 light setup, going for a 4:1
Bright side meter, facing light: f/11
Dark side, facing light: f/5.6
Overall exposure: f/8 (literally halfway.)
So, I take the halfway point between the bright and overall for: f/9 or f/10.
16:1 ratio:
Bright side: f/16
Dark side: f/5.6
Overall: f/9 or f/10
Camera setting: f/11
Now, when you set the lights, it's in fractions of the lights output potential, so I couldn't really tell you what those would be set to. But these are all actual camera settings. (Note, shutter speed doesn't really matter, but I stay at 160-200 usually.)
Edited by BlueEyesPhoto on Feb 24, 2006 at 04:01 PM GMT (Reason: Correct Ratios, I think . . .)
Edited on Dec 21, 2007 at 11:13 PM
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