Optical device, control method therefor, and program for implementing the control method

A control method for an optical device having a first lens unit configured to be driven by a first drive source and a second lens unit configured to be driven by a second drive source and provided rearward of the first lens unit on an optical axis, comprising:

• a detecting step of detecting a reference position between a first reference position of the first lens unit and a second reference position forward of the first reference position;
• and
• a control step of controlling the first and second drive sources such that extension of the first lens unit forward from the first reference position is started, and after the reference position is detected in said detecting step, extension of the second lens unit is started.

A control program for causing a computer to execute a control method for an optical device having a first lens unit configured to be driven by a first drive source and a second lens unit configured to be driven by a second drive source and provided rearward of the first lens unit on an optical axis, comprising:

• a detecting module for detecting a reference position between a first reference position of the first lens unit and a second reference position forward of the first reference position;
• and
• a control module for controlling the first and second drive sources such that extension of the first lens unit forward from the first reference position is started, and after the reference position is detected by said detecting module, extension of the second lens unit is started.