Zoom and focus control system in an optical system

A control process executable in an imaging device that includes a lens system with a focusing lens and a zoom lens, and a zoom and focus controller, the control process comprising:

• a processing logic capable of determining distance of the focusing lens from a starting point at a selected zoom position;
• a processing logic capable of accessing the infinity focusing curve to determine a position on the focus infinity curve for a next zoom focal position;
• a processing logic capable of accessing a second stored information to determine a position of the zoom lens for the zoom focal position;
• and
• a processing logic capable of accessing a third stored information to offset focusing for an actual focus distance.

A method of controlling zoom and focus in an imaging device that includes a lens system with a focusing lens and a zoom lens, and a zoom and focus controller, the method comprising:

• determining distance of the focusing lens from a starting point at a selected zoom position;
• accessing the infinity focusing curve to determine a position on the focus infinity curve for a next zoom focal position;
• accessing a second stored information to determine a position of the zoom lens for the zoom focal position;
• and
• accessing a third stored information to offset focusing for an actual focus distance.