The Canon IXUS X-1 is an APS-format compact from 1999 built specifically for underwater and rugged use, sold in North America as the ELPH Sport and in Japan as the IXY D5. It extended the original titanium IXUS design language into a waterproofed body aimed at divers and water-sports users.
It has a fixed 23mm f/4.8 lens (roughly 29mm equivalent), shoots APS film with the format's selectable print sizes, and uses a rotating bright-line viewfinder that adjusts framing for each APS aspect ratio. Flash and shooting modes are set via a mechanical dial marked with a 'fish' icon for underwater use.
Its underwater-oriented ergonomics set it apart from the rest of the IXUS APS range: an oversized viewfinder and shutter button suit use with gloves or diving gear, and a hinged base sealed with an orange O-ring keeps water out of the film compartment.
APS film is scarce today, so these are bought mainly as collectible or novelty pieces rather than for regular shooting. Buyers should check the O-ring seal is intact and supple, test the mechanical mode dial moves freely, and inspect the lens for internal moisture damage.