![]() Like the GH3, the GH4 has Wi-Fi connectivity built in, but this is joined by an NFC chip to enable quick connection to other NFC devices such as Android phones and tablets. Panasonic will distribute the GH4's Interface Unit through its professional video and channel, as it will appeal to professional videographers who plan to use the GH4 as part of a rig with an external monitor, recording facility and so on. This unit also adds audio monitoring and control capability, as well as the ability to use an external timecode to synchronise several cameras. It also has two XLR microphone ports, a phantom power supply for mics and four SD video-out sockets. The Interface Unit is pretty large, but then it does add two XLR ports As before, both are OLED units and the main screen is touch-sensitive. Panasonic has improved both the electronic viewfinder and the three-inch vari-angle screen since the GH3, giving the two devices in the GH4 higher resolutions of 2,359,000-dots and 1,036,000-dots respectively. In addition, there's also now a Zebra view which indicates bright areas in the scene that are in danger of burning out. This is accompanied by the picture-in-picture view first seen with the GX7 to allow the whole scene to be seen while an enlarged view is visible. ![]() Happily, the GH4 has focus peaking to help with manual focusing and video recording by highlighting the areas of highest contrast. The row or column option could be especially useful when panning with a moving subject and wanting to keep one plane sharp.įocus peaking was high on the list of demands for the GH3, but it never arrived in a firmware update. In the latter mode the active AF points can be limited to a row or column of points, or two a group (or two) or pattern defined by the user. In addition, the camera has a 49-area AF system (the GH3 has 23 areas) and the selection method may be set to Face/Eye Detection, Tracking, 49-Area, 1-Area, Pinpoint or the new Custom Multi mode. ![]() Uematsu is also keen to emphasise that all the improvements required to allow 4K recording have a positive knock-on effect for still images. The faster processing engine, quicker sensor read-out and cleaner signal should enable the camera to focus its lens in poorer light, and Uematsu says that the GH4 can focus down to -4EV. Panasonic claims that this enables the GH4 to achieve a focus time of 0.07 sec whereas the GH3 achieved 0.09 sec. This system looks at the contrast of the scene at two different defocused points to help it calculate the correct focus point more quickly. Panasonic has introduced a new approach for the GH4, which uses its novel DFD (Depth from Defocus) Technology. One of the challenges for compact system camera manufacturers has been to improve the speed of their autofocusing, because they use the traditionally slower contrast detection system. Panasonic will introduce a UHS-III card when the GH4 comes to market. This rate drops to 7.5fps in continuous autofocus mode. ![]() In single-AF mode the GH4 can shoot continuously at up to 12 fps (frames per second) with a UHS-III SD format card installed. In comparison the GH3 has a range of ISO200-12800, with ISO125 and ISO 12,800-25,600 being available as expansion settings. Clearly the company is confident of the GH4's noise control, as sensitivity may be set in the native range of ISO 200-25,600, with ISO 100 as an expansion setting.
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