Just when you think you’ll never have to calculate another flash setting again thanks to Nikon’s amazing CLS (Creative Lighting System) along comes a guy who can explain why occasionally CLS gets the exposure wrong. I demo Nikon’s wireless flash system using two SB-900s and the on-camera speedlight as a controller.
When shooting against a black background, CLS creates perfectly exposed images. But sometimes it doesn’t and I’ve never taken the time to figure out why. Often when the exposure is coming out wrong I switch all my flashes to manual and dial up the amount of light I want without benefit of CLS. I also put the camera in manual mode and I use a flash meter to set my exposure. Takes longer but it gives me 100 per cent control.
Now here comes a guy who can actually explain why CLS occasionally goofs the exposure. This link is to Digital Photography – Tips and Tricks.