Quote:
Originally Posted by bobbyz
Benji,
You say " My background lights read F 10 at the subject. I take ALL meter readings at the subject, so for my background light reading I place the dome of the meter right beside the cheek of the subject aimed at the background and I take my reading."
I tried that where my main was at f8, and bg as measured at my subject with the dome (recessed) pointing towards the bg was at f10. But that settings gave me horrible flare on my subject. Subject was 6 feet away from the bg and bg light was behing the subject, hald way between subject and white seemless bg. I had to crand my bg light way down to get good exposure on the subject and still keep white on the bg.
I don't understand why it has to be f10 at the subject pointing towards the bg and don't care of what's actually falling on the bg? Suppose I increase the bg to subject distance. Now I will have to increase output of my bg light to get f10 on the subject. That will throw more light on the bg than what's needed to make it white but now totally over blwon, isn't it? Just trying to learn.
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When you are measuring the light falling on the background, the background is your subject. If you are measuring the incident light reflected from the background and falling on your primary subject, then you aren't really measuring anything, because that part of your subject isn't in the picture. It's different if you're measuring rim light or hair light.
When you measure the incident light falling on your background, that doesnt change when you move your subject or your camera, within reason. If you take an incident reading on the stage at a concert, that reading will be the correct exposure whether you are in the front row or the back row, providing the light doesn't change.
Bill