Studio Light Lighting
What is the 1 and 2/3 rule for studio lighting?
I’m doing a studio portrait at university tomorrow in the studio and am still a bit uneasy about the light metering rules, especially since digital cameras have many f-stops between. I want to get a stock standard portrait before I get creative with the lighting. I’ll be using a soft box, hair light and background light. Can someone please explain it to me?
Otherwise called 3:1
A 3:1 lighting ratio has a 1 stop difference between the key and fill light.
Picture it this way. Place the main or key light on one side, your choice right or left, so that it lights one side of the face fully and partially lights the other side. Then place your fill light on the lens axis, above and behind the lens. The lens is usually set at eye level, the fill light behind and above it.
Adjust the power to your lights so that the key light is twice as bright as the fill that is, one stop brighter than the fill light.
Now you have 2 units of light from the key light and 1 unit of light from the fill light. The fill light puts 1 unit of light on the shadow side of the face and on the highlight side of the face at the same time because of its position at the lens axis.
One unit of light from the fill on the shadow side and 2+1 units of light from the key and fill lights on the light side of the face. A 1:3 lighting ratio.
Studio Lighting part 4 of 8
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