Often light is coming from the front or the side, however it can be very interesting to use light from the back.
Now how do you meter something like this?
In fact it’s very simple.
An incident light meter will meter the light falling on the subject and give you the correct reading, if you put that value in your camera you’re subject will be properly lit. Now a lot of people tell you different things about light meters, ranging from “you don’t need one” to ….. well let’s put it this way a lot of confusion is caused.
Trust me when I tell you that a light meter is just a tool, it gives you a way to very quickly get a proper exposure and it’s not hard to use. As you can see in these examples I metered the front of the face of the models and put that exposure in the camera, the only light source used is an Elinchrom Ranger behind the model, so the “scatter light” actually lights the model and is metered. In a studio environment it will often (99.9%) means you’re metering towards the light source, but as you see with this setup I now actually metered towards the camera. Just remember that you hold the meter in front of the area you want to be correct and meter “the light” that is hitting THAT area, it can be the strobe straight on, but also scatter light or ambient light.