December 8, 2014, 10:36 AM
As noted in my GH4 review earlier this year, first-run GH4s suffered from an “audio buzz” problem, most noticeable with a third-party mike plugged in. This problem affected early shipments of the camera running version 1.0 firmware; later shipments with firmware version 1.1 or later pre-installed have been factory-updated to fix the problem. Panasonic offers an in-warranty fix for first-run GH4s; you send the camera body with its body cap, and nothing else – no SD card, no battery – to Panasonic’s facility in McAllen, Texas. They rework the audio circuitry, and ship the camera back (details at the end of this article).