Getting back to the original topic (with apologies to all of course), part of the answer depends on what you mean by minimal depth of field. Is the DOF in the attached images minimal enough? If so, then David Allen is right on the money. You won't need anything but your camera, your flash and brilliant artistic instinct. If you are shooting close with mediumish format then you will not have much DOF even at modest apertures. Well done fill flash never fails to thrill so best of luck!