I'm a bit skeptical of the one-handed idea. With the current unit, you need to keep one finger stationary over the display while you track the camera with the other. If you were tracking with one hand, it might be difficult to feel the display with say your middle finger while moving the camera with the other fingers. But maybe someone came devise a workable design. Chris To unsubscribe at any time, just send a message to: optacon-l-request@xxxxxxxxxxxxx with the word "unsubscribe" (without the quotes) in the message subject. Tell your friends about the list. They can subscribe by sending a message to: optacon-l-request@xxxxxxxxxxxxx with the word "subscribe" (without the quotes) in the message subject.