"A Photographer's Bread and Butter"4.5 starson by Jose-Arreola
Pros: Easy to use, Great low-light performance, Great video qualtity
New LCD screen is gorgeous, 3.2" diagonal
Auto-exposure system seems very accurate
Very high FPS (a small improvement over D3S)
Built-in ethernet port for tethered shooting
Cons: Pretty expensive
Summary: The personal imaging revolution is upon us. If you are someone looking for an excellent, full-frame DSLR, the D4 is very, very good. Nikon is correct in calling their D4 digital single lens reflex camera a "total professional imaging machine". The new flagship DSLR features a 16.2 megapixel full-frame sensor with an ISO range of 100 to 12,800, expandable to an eye opening 204,800. Ranges like that are enough to shoot in near complete darkness. Extra improvements over the prior model include 10 frames per second shooting, a 91,000-Pixel RGB 3D Color Matrix Metering III sensor to deliver even more accurate colors and exposure, and an improved 51 point AF (auto focus) system. The Nikon D4, which is a digital SLR camera, is perfect for someone who likes shooting fast and remarkably sharp images; however, I wish you luck in finding one.
The new LCD screen is gorgeous. 3.2" diagonal with a 170° viewing angle, it's possibly the best quality LCD screen ever put on a DSLR. Its rotating ability allows me to be more creative with angles and depth of field. In fact, many options on the camera allow me to be as imaginative as I want when shooting. The on screen menus are stress-free, easy to understand and simple to navigate through. "Live View" is an excellent way to make on the spot concise focus confirmation, if you've never used a DSLR with live view, you'll love it. The only negative of this feature is that it can really drain your battery and can only be used for a certain amount of time before the imager circuitry heats up, which will add noise to your pictures. I did order the camera with the optional Tg-bgd40 battery grip. This accessory makes the camera taller and rugged which in the end makes it easier to hold. The grip also lets you use 2 Nikon lithium batteries or 6- AA alkaline at the same time as you use the camera's battery. In my experience it has increased battery life by 10-15 hours depending on whether I shoot in JPEG or RAW. All in all, it's a very valuable accessory to consider.
The auto-exposure system seems very accurate. Amazing auto focus features like 51 AF points, an AF mode selector switch, and fast AF point selection, ensure accurate, fast shooting whether the subject you are shooting is a room full of children or a high-speed sporting event. Speed is such a crucial element with photography so having a camera that can keep up is a blessing. Missing shots to metering issues or focus glitches is now a thing of the past.
The biggest single problem exists in the video mode so it doesn't bother me too much. In the HD video mode you have no control over ISO settings and shutter speed. These settings are essential in creating perfect exposure for your image, avoiding shots that are too dark/bright. There's an exposure lock button that will lock the exposure variables to whatever the LCD displays at the time you press the button but there are no on-screen indicators that show the settings that the camera has chosen for you. Basically, you move the camera around in the scene and let the brightness drift up and down. When you see what you think is a good exposure on the LCD screen, you press the lock button. Since the exposure lock resets after each scene or take, chances are you won't have consistent exposures over multiple takes of a particular scene.
The Nikon D4 is an excellent still camera and in my opinion, money well spent. All cameras at any price level have positives and negatives. I've never found or used the "perfect" camera. What seemed like a hopeless, unattainable expense when I first started shooting five years ago turned into a reality after I spent time printing (or developing) and making my money off my prints. A well-earned upgrade from the D3S and it was worth the wait and the price! It is an excellent glimpse into the future of "hybrid" still & video DSLR cameras.
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Hope this review is help you.