Autofocus system via 2 fixed focus zones 0.55m-1.3m, 0.6m-infinity Battery: High performance lithium-ion battery (750mAh), rechargeable via USB Outer shell: Polycarbonate + ABS plastics Focal length: Close-up (lens 1) 94.96 mm, Distance (lens 2) 102.35 mm Flash system: Vacuum discharge tube storage Lenses: Optical grade Polycarbonate and Acrylic lenses, coated Shutter system: Custom design, using precision step motor for shutter