Abstract: A lens module for a digital image-capturing device includes a seat including a base wall with an opening formed therethrough; a telescopic pipe disposed in front of the base wall and including a rear pipe part that extends forwardly from the base wall and that is axially aligned with the opening in the base wall, and a front pipe part coaxially and movably coupled to a distal end of the rear pipe part; a lens assembly removably coupled to the front pipe part; and an image sensing device mounted rearwardly of the base wall to receive an image focused by the lens assembly through the opening. Movement between the rear and front pipe parts results in adjustment of a focal length between the lens assembly and the image sensing device.