Mainly I set R9 to "F" mode, (shutter to 250 sec or slower) then aim lens at grey card (about where my subject is), press down on the "stopping down slider" to set off flash and to get reading. Once I get reading and set the f-stop to correct setting, would I then press the shutter button to take the picture while it's still in the "F" mode? Or take that reading, set the camera mode to "M" then take the picture?