Oh dear this is embarresing. I set up my F5 with the Sb24 flash on top. Set the camera to Shutter priority and the flash to Matrix Balanced Fill Flash. Well I set the Shutter to 1/200 and the camera always keeps the apeture at F2.8! Call me a nonse but is this right, or have I forgotten something somewhere, it does the same regardless of the shutter speed? Thanks, -- JPG Photography Professional 35mm Photography [EMAIL PROTECTED] http://www.jpgservices.ndirect.co.uk Call: (+44) (0)121 602 0857