The DRA0002 is a tall flat port (80mm) intended for longer macro lenses.
 
To make sure this port is suitable for your lens, measure the distance between the back of the camera and the tip of the lens you intend to use. If the distance is between 158 mm (6,2 inch) and 178 mm (7 inch), the DRA0002 is suitable for you. If the measured distance is longer than 178 mm (7 inch), please consider using the DiveRoss Tall flat port (DRA0002) with port extension (DRA0004). If the distance is shorter than 158 mm (6,2 inch) consider using the DiveRoss short flat port (DRA0001).