An optical assembly for an image capture device that defines an optical axis and includes an optical module having: a lens holder; a first optical group supported by the lens holder; a lens barrel axially movable in relation to the lens holder along the optical axis; a second optical group supported by the lens barrel such that the second optical group is axially movable in relation to the first optical group along the optical axis to thereby adjust focus of the image capture device; and an adjustment member in engagement with the lens barrel such that rotation of the adjustment member causes axial movement of the lens barrel and the second optical group along the optical axis. In various embodiments, the adjustment member may be configured for rotation about an axis of rotation that extends in (generally) parallel relation or in (generally) orthogonal relation to the optical axis.