Panasonic H-X09 9mm f/1.7 LEICA SUMMILUX LensThe LEICA DG SUMMILUX 9mm F1. 7 is for use by professionals and high amateur users for both photo shooting and video recording, capable of smooth, silent operation to work with the cameras high speed, high precision contrast AF system with the sensor drive at max. 240 fps. For the non linear setting, focus is shifted with a variable amount according to the rotation speed of the focus ring while focus is shifted with a designated amount according to