Main Features: Fast 25–50mm zoom lens for Micro Four Thirds 50–100mm full-frame equivalent focal length Constant f/1.7 maximum aperture throughout the zoom range Aperture range f/1.7–f/16 Fast and quiet linear autofocus Internal focusing system Virtually no focus breathing Focus Clutch mechanism for quick AF/MF switching Stepless de-clicked aperture ring for video Minimum focusing distance of 28 cm Rounded 9-blade diaphragm Splash dust and freeze-resistant design 77 mm filter thread Weight 654 g