Without a doubt, the top-of-the-line Nikon DSLR line is the most feature-rich, responsive and most capable cameras, and the D4s is not an exception. While the exterior of the D4s is practically identical to the D4(more on ergonomic changes on the next page), the inner core is where the camera got the most upgrades. The 16.2 MP sensor got a boost in native sensitivity range, going from ISO 100 to 25, 600, which is a stop higher than what the D4 had. The camera’s metering and white balance systems got tweaked with more features. The autofocus system was improved with more features and faster shooting rate of 11 fps with full time autofocus(versus 10 fps on the D4). While these might look like very small incremental changes that are not worth upgrading for, even slight improvements in autofocus performance might pay the price of the camera for a working professional. And that’s where the Nikon D4s delivers. Thanks to the new EXPEED 4 processor that is 30% faster than its predecessor, the camera can handle data much faster, giving a significant boost in overall performance. And this is not coming from Nikon’s specifications or data sheets – our team immediately noticed the camera to be faster and more responsive in autofocus operation, particularly in continuously tracking fast-moving subjects. The faster processor also allowed Nikon to push more data for capturing high definition video and the D4s is now capable of recording HD videos at up to 60 frames per second. Along with the ability to pick different crop modes, full exposure control, uncompressed HDMI output and the ability to record videos to both internal memory and external recorders, the Nikon D4s is also a very capable camera for videography needs. Sadly, despite the industry’s push to ultra high resolution 4K video, the D4s still lags behind when compared to other manufacturers like Sony and Panasonic.