For reliable recording of rich video, the DMC-GH4 complies with UHS Speed Class 3 (U3) which is the new speed class standard of SD memory card. The UHS Speed Class 3 (U3) guarantees a constant minimum write speed of 30MB/s to respond to market needs for 4K video.
Optional Accessories
A GN58 powerful External Flash (DMW-FL580L) is newly added to the LUMIX G optional accessories which allows high speed charging of approx.1.7 sec. Not only wireless control but also LED video light function are available. The Stereo / Shotgun Microphone (DMW-MS2) which enables stereo / shotgun switch even allows more precise sound recording with selectable Super Shotgun / Lens Auto / Manual option on DMC-GH4.
6. Other Features
Luminance Level Adjustment
Just as the concept of “ultimate hybrid Digital Single Lens Mirrorless camera” identifies, the DMC-GH4 supports smooth postproduction for photographers newly challenging videography. In addition to the standard luminance level of 16-235 and 16-255, DMC-GH4 offers 0-255 which is equivalent to photo standard (16-235, 16-255 and 0-255 are all 8-bit).
Focus Peaking
For more practical control over focusing, the DMC-GH4 incorporates Focus Peaking function that shows the peak of focus in MF and AF+MF mode. Users can see the peaking of focus while monitoring the subject in live view. It can be set to HIGH / LOW / OFF and the color can also be changed to blue, white or orange according to the color of the shooting scene during live view. Users can take advantage of this function when controlling the camera with smartphone / tablet via Wi-Fi in both photo / video recording.
Silent Mode
This mode switches shutter from mechanical to electronic and turns all sound (AF, operation) off while suppress emission of AF assist lamp and flash with just a single setting for special shooting occasions.
Highlight/Shadow Control
The Live View function is also advanced digitally making it possible to adjust highlight / shadow separately with the front/rear dial. 3 patterns of settings can be customized in addition to 3 patterns of preset.
RAW data development in Camera
The DMC-GH4 is capable of developing RAW image in camera. In addition to the color space setting ( sRGB / AdobeRGB ), the parameter of white balance, exposure compensation, contrast, highlight/shadow, saturation, noise reduction, sharpness or hue can be flexibly adjusted while LUMIX’s
Photo Style, Intelligent D-range Control, Intelligent Resolution can also be applied.
Interface Unit (DMW-YAGH) 
Panasonic newly offers an Interface Unit (DMW-YAGH) exclusively for professional/industrial workflow with the DMC-GH4 that enables more powerful video transmission. It complies with Full HD (4:2:2 / 10-bit) four parallel outputs and these can be used for 4K (4:2:2 / 10-bit) output – both with time code*1. The XLR input terminals (2ch) are also equipped to connect line or condenser microphone. When connecting with microphone, volume can be controlled for L and R separately, which can be monitored LED audio level display on the back of the unit. The 12V DC IN is highly compliant with large-capacity industrial battery and continuously supplies the DMC-GH4 with power*2.
