Exposure metering in the studio with flash can’t be executed automatically by the camera because the light source is only active at the moment the image is recorded. You’d have to grope your way towards good results step by step with test shots.
If you don’t want to limit yourself to this trial-and-error method in order to ascertain correct exposure values, you can seek the advice of a handheld exposure meter. With the help of this tool you’ll easily be able to find the right parameter settings for exposure time and f-stop for photography with continuous light as well as when using flash units.
Read more about this issue in an excerpt from a book published by Rheinwerk Verlag.