says that the film was shot using both the Arrivision and StereoVision single strip-over-and-under units. Both cameras were used in conjunction with each other. This is a means of shooting 3D movies in normal color with a single camera and single strip of film: the Arrivision 3D technique uses a special twin-lens adapter fitted to the film camera, and divides the 35 mm film frame in half along the middle, capturing the left-eye image in the upper half of the frame and the right-eye image in the lower half, a technique known as "over/under". This allows filming to proceed as for any standard 2D film, without the considerable additional expense of having to double up on cameras and film stock for every shot. When the resultant film is projected through a normal projector (albeit one requiring a special lens that combines the upper and lower images), a true polarized 3D image is produced. This system allows 3D films to be shown in almost any cinema since it does not require two projectors running simultaneously through the presentation ⁠— something most cinemas are not equipped to handle. What is required of the theatre is both the special projection lens and a reflective "silver" screen to enable the polarized images to reflect back to the viewer with the appropriate filter on each eye blocking out the wrong image, thus leaving the viewer to see the film from two angles as the eyes naturally see the world. According to the company that built the underwater camera housings for Jaws 3-D, the underwater sequences were shot using an Arriflex 35–3 camera with Arrivision 18 mm over/under 3D lens. This kind of 3D effect does not work on television without special electronic hardware at the viewer's end, and so with two exceptions, the home video and broadcast TV versions of Jaws 3-D were created using just the left-eye image, and with the title changed to Jaws 3 or Jaws III. Because the left-eye image only takes up half the 35 mm film frame, the picture resolution is noticeably poorer than would normally be expected of a film shot on 35 mm. One of the exceptions was a 1986 release of the film for the now-obsolete Video High Density (VHD) video disc system. This required a special 3D VHD player, or a standard VHD player with a hardware 3D adapter, and a set of LCD glasses