Sony recently released un updated version of the firmware for the DSC-RX100 camera. According to Sony, the new firmware, Version 1.10, improves the operation of the autofocus mechanism to reduce noise and vibration during focusing. Here is a link to a page where the updated firmware can be downloaded; instructions for installing it are provided there also.
I have not used this update myself, because I no longer have my RX100 camera. It sounds like a worthwhile upgrade, though.
For general information about the RX100, see the guide book available through this site and from other sellers.
Ik heb de update 1.1 uitgevoerd op mijn RX100. Alle trillings- en geluidsproblemen bij het scherpstellen zijn opgelost.
Good — I am glad to hear that. Thanks for posting the information.