I have a Canon 40d and am struggling with trying to get my studio lighting right. I took this shot with the camera on manual mode, 7.1 aperature, 200 ISO, 1/20 shutter speed, custom white balance. I'm using a single 500 watt softbox and have two 250 watt tungsten spot lights on the background. How can I compensate and lighten the background up? I don't like how dark and contrasty it's looking. With my older camera - Fuji S9100 - the background always came out much lighter with the same exact lighting setup. Thanks!