Nikon calls their D4 Digital SLR Camera a "total professional imaging machine". They would be correct in doing so. Designed for the working photographer, the D4 meets the most-demanding photog's needs and then some. Packed with features essential to getting the job done, and getting it done well this rig is more than a digital camera, it's a shooter's bread and butter.
Building off the basic structure of its predecessor, the D4 goes big in a number of ways which are sure to be appreciated. The camera features a 16.2Mp 36 x 23.9mm CMOS sensor with Nikon's FX-format and the EXPEED3 image processor. ISO sensitivity can now be extended as low as ISO 50 or as high as 204,800 with a standard range of 100-12,800 ISO. Additionally, 10 frames per second continuous shooting in FX-format for up to 200 shots ensures the decisive moment will not be missed.
The D4 records in RAW, JPEG, TIFF, and RAW + JPEG files. Metering options include RGB 3D Color Matrix III metering, center-weighted, and spot. Additionally, compatible storage media includes the future of professional storage, XQD memory cards, and Type I CompactFlash memory cards (UDMA compliant). Of course, NIKKOR AF-S and AF-I lenses are compatible with the D4 body, putting an extensive line of lenses at the photographer's disposal.
Another improvement on D4's little brother would be the slightly bigger LCD screen. Up from 3", the D4 has a 3.2" LCD monitor with a 170° viewing angle, approximately 100% frame coverage, automatic monitor brightness control, and Live View. In Live View the image can be enlarged up to 46x to make on the spot focus confirmation. Surrounding the monitor are illuminated buttons for ease of use even in low light. Additionally, quick access Live View confirms exposure, white balance, monitor hue, histogram, focus mode, AF area mode, and focusing accuracy with ease.
The D4 also boasts stellar auto focus features - like 51 AF points, an AF mode selector switch, and fast AF point selection. All three of these components of the AF system ensure accurate, fast shooting whether the subject is a room full of children or a high-speed sporting event.
Of course, the D4 wouldn't be a professional level DSLR if it didn't include full HD video capture. The D4 does so, making it equally a pro videographer's tool as much as a pro photographer's. From 1080p broadcast quality video at 30 or 24 fps to full manual control to the option to add an external mic for stereo audio capture, the D4 isn't just a digital camera that also captures video.
Features like the aforementioned Live View allow the videographer to confirm capture of their footage on the camera's LCD and an external (optional) monitor simultaneously. It also gives you access to Picture Controls to handle the look and feel of the video, in-camera. Peak audio meters also allow the videographer to adjust sound levels manually in 20 incremental steps. Remote start and stop of view using wired and wireless remote accessories is also an option, among many others.