The telescope is modeled after older style scopes. It can be focused by fully extending the entire body of the telescope, then slowly contracting and expanding the eyepiece portion only. Item Specification Product Type-Spy Glass Telescope, Total Length -15in when fully extended This maritime brass 16in telescope 3 fold is a quality reproduction of an antique brass spyglass telescope. The telescope is inset with superior optical Lenses to deliver a magnification of 10x. An extendable sun visor blocks reflections from the waters surface.