Abstract: A lens barrel may be detachably coupled to a capturing device may comprise a first lens assembly having first lenses mounted therein. A second lens assembly may be coupled to the first lens assembly and may have second lenses mounted therein. The second lenses may be aligned with the first lenses along an optic axis, and an adjusting portion may be provided in the first lens assembly and may be configured to adjust a position of the first lenses relative to the second lenses along a direction the optic axis by an electromagnetic force.