1939 ROLLS ROYCE WRAITH This type of picture has plenty of time to be taken. In order to get a good depth of field and accurate focusing, the car was parked in position and the camera fitted to a tripod. The exposure was metered and a small aperture selected - F16 - along with the corresponding shutter speed for correct exposure. A slow speed would not matter as nothing would move. The exposure was then made using a cable release.