This i-CS Lens from Axis Communications is designed to be used with Q1645, Q1645-LE, Q1647, and Q1647-LE 5MP cameras. It features a 3.9-10mm focal length with an aperture of f/1.5. Angle of View Q1645: 109-42° Q1645-LE: 92-42° Q1647: 110-44° Q1647-LE: 92-44°