I don't think either one of us knows what you're trying to do. The Sekonic is typically used in incident mode so it is measuring the amount of light falling on the subject. Cameras measure reflected light from the subject. The amount of light reflected from a subject depends of the reflectivity of the subject. The exposure reading the camera gives also depends on the metering mode (spot, average, evaluative/matrix). The only time that one would expect the Sekonic and camera to give the same exposure reading is if you had a grey card and measured the light falling o the grey card and the camera set to average and the grey card filled the frame.