Digital Photography Review reports: [edited]
The GH3 is the company's largest Micro Four Thirds camera yet, with dimensions that match those of the APS-C Sony SLT-A65.
It gains a weather sealed (dust/splash proof) magnesium alloy body. Additional highlights include 6 fps shooting (or 4fps with live view) and five customizable function buttons. While the camera's still image resolution remains at 16MP, the GH3 has a new Live MOS sensor, three-core Venus 7 FHD processing engine and a new low pass filter. Panasonic claims improvements in high ISO shadow detail, color reproduction and white balance over its predecessor.
The GH3 also offers in-camera HDR and multiple exposure image modes, as well as Wi-Fi connectivity that Panasonic hopes to leverage with its own (as yet unreleased) remote triggering and image transfer apps for iOS and Android phones.
The GH3's new EVF is a 1.7 million dot OLED panel with a 16:9 ratio of 873 x 500 pixels. Panasonic lists a robust 1.34x magnification (equivalent to 0.67x on a full frame SLR) ,and says that because information is transmitted to the panel 8x faster than the GH2
The rear display panel is a 3" 614k dot resolution OLED unit that, like that of its predecessor, is touch-sensitive. For both stills and video shooters looking to extend the camera's abilities, the GH3 offers a 3.5mm mic input (GH2 users had to resort to a 2.5 - 3.5mm adapter), headphone jack, PC sync socket and a new optional battery grip that attaches to base plate providing the option for additional power.