LCD and Viewfinder
Nikon D4s has a Fixed Type 3.2″ LCD screen with a resolution of 921k dots. The Nikon D4s's 3.2″ screen is larger than average and its resolution is up to the class standarts.
D4s has a built-in Optical (pentaprism) viewfinder. The viewfinder has a coverage of 100% and a magnification ratio of 0.7x. 100% coverage ensures that what you see in the viewfinder while shooting matches exactly what you will get later in your image, helping accurate framing your shots and minimizes the need for cropping images later.
Max Shutter speed
Nikon D4s can shoot continuously at max speed of 11 fps and has max shutter speed of 1/8000 sec.
Flash
Unfortunately D4s doesn't have a built-in flash but it has a flash shoe for mounting external flashes.
Focusing
Nikon D4s features both Contrast Detection and Phase Detection autofocus (AF) systems which ensures speed and accuracy of focusing in most situations. The AF system has 51 focus points and 15 of these sensors are of Cross-type. Cross-type sensors locks focus faster and more accurate compared to single type sensors.
Nikon D4s also features
Face detection AF where it intelligently detects the faces in the frame and locks the focus automatically.
Video Features
With Nikon D4s, you can record your videos at a highest resolution of 1920 x 1080 at 60,50,30,25,24 fps with bit rates up to 42 mbps and save in MPEG-4 and H.264 formats. Full HD resolution of Nikon D4s will be adequate in most of the situations. But if you are after the highest resolution videos available, see our list of Top Cameras with 4K (Ultra-HD) Video. You can also consider its successor, the Nikon D5 which features 4K video recording.
D4s has a built-in Mono microphone and a Mono speaker. Nikon D4s also has a port for an external microphone and a headphone port for connecting external headphones which make Nikon D4s a very suitable camera high quality videography.
Connectivity and Storage
You can connect D4s to compatible devices via its HDMI port or USB 2.0 (480 Mbit/sec) port.
Battery Nikon D4s is powered by battery which provides a shooting life of 3020 according to CIPA standards.
Considering that the average battery life of DSLR type cameras is 883 shots, Nikon D4s has a good battery life for its class.
Battery Life Comparison in Pro DSLR Cameras
Nikon D3X with its 4400shots is the model with longest battery life among Pro DSLR cameras. Check the comparison of Nikon D4s vs Nikon D3X or take a look at Longest Battery Life DSLR cameras list.
Nikon D4s Features Compared to Main Competitors
User Manual
You can download Nikon D4s's User Manual here