Retra, in conjunction with Italian photographer Michele Davino, has created an underwater motorized zoom system. The eZoom is an aluminum structure that contains an electric motor and power supply which meshes with a lens’ zoom ring. The motor can be controlled with push buttons on the device. This can create images wherein zoom lenses are zoomed out while the shutter is open, creating a motion blur around the outside of the frame, but typically leaving the center in focus, similar to what can be achieved with Fresnel lenses. This technique has been used for some time, but the practicalities of zooming whilst maintaining camera focus and steadiness with one hand has limited its use.
Price and availability of the eZoom are still to be announced.