Nikon D4S Review

Camera Reviews > Nikon Cameras > Nikon D i Now Shooting!
Basic Specifications
Full model name: Nikon D4S
Resolution: 16.20 Megapixels
Sensor size: 35mm
Kit Lens: n/a
Viewfinder: Optical / LCD
ISO: 50-409600
Shutter: 30-1/8000
Max Aperture: n/a
Dimensions: 6.3 x 6.2 x 3.6 in.
(160 x 157 x 91 mm)
Weight: 47.6 oz (1,350 g)
includes batteries
MSRP: $6,500
Availability: 03/2014
Manufacturer: Nikon
Nikon F mount 35mm
size sensor
image of Nikon D4S
Front side of Nikon D4S digital camera Back side of Nikon D4S digital camera Top side of Nikon D4S digital camera Left side of Nikon D4S digital camera Right side of Nikon D4S digital camera

Nikon D4S Review -- Now Shooting

Overview by & Tech Info by Mike Tomkins

04/18/2014: Shooter's Report Blog Part I: Unexpected swans

Nikon D4S Review -- Beauty shot

Taking Nikon's flagship, professional-level DSLR model to the next level, the newly-announced Nikon D4S aims to expand upon the company's top-ranking D4 with an improved autofocus system, an insanely high ISO range, better speed and performance, as well as beefed up video recording specs. Although, by appearances, the D4S is not strikingly different from the D4, its under-the-hood improvements to performance and a number of niche features aim to satisfy a wide variety of professional photographers, from sports and wildlife shooters to photojournalists and multimedia producers.

Performance. Although the Nikon D4S keeps the same 16.2-megapixel FX-format CMOS sensor resolution, the sensor itself has been redesigned and paired up with Nikon's latest EXPEED 4 image processor to provide 30% faster processing over the EXPEED 3. While the standard ISO range has been increased up to 25,600 (from 12,800), the D4S is also capable of an expanded ISO up to an incredible 409,600 (double that of the D4), making the D4S capable of producing images in some of the darkest of conditions. Photographers of fast action will also welcome the increase to 11 frames-per-second burst shooting with continuous AF and auto exposure (up from 10fps; the D4 was capable of 11fps only with AF/AE locked). Buffer depth improves to a 200-shot capacity for full-resolution Fine JPEGs versus 170 for the D4 -- no word on buffer capacity for RAWs yet, however.

Nikon D4S Review -- Front view without lens

Autofocus. The D4S brings over the Multi-CAM 3500FX 51-point autofocus system from the D4, but introduces a new "Group AF" mode, which activates the four surrounding AF points to a specific single AF point to help keep focus while tracking small, fast-moving subjects. If the subject moves out from behind the central AF point, the corresponding 4 AF points can help maintain focus. The Group AF system is reminiscent of Canon's 4-point AF Point Expansion mode on their high-end DSLRs.

Nikon D4S Review -- Ports

The D4S also has what Nikon calls "AF point position memory," which keeps the AF point aligned respective to the frame when changing from landscape to portrait orientation and vice versa.

Workflow. For many professional photographers, such as sports shooters, speed and performance of the AF system and burst shooting is not the only critical feature they demand from their camera, but the speed at which they can get images out of the camera and off to editors, clients and others is also very important. The D4 included a 100Base-T Ethernet jack for fast image transfers straight from the camera while shooting. The D4S now includes a 1000Base-T (Gigabit) Ethernet connection providing a transfer rate of up to 185Mbps (up from a comparatively meager 60Mbps on the D4).

Other workflow-related improvements include a new "RAW SIZE S" file option, which produces 12-bit uncompressed NEF files at 2464 x 1640 (approximately half-resolution) with a file size of around 12MB. For those shooters who don't need full 16MP images or are trying to maximize the capacity of their memory cards while still wanting the editing flexibility of RAW, this is a beneficial feature.

Nikon D4S Review -- Rear 3/4 view with battery open

Battery. Battery life has also been improved not only thanks to the more power-efficient EXPEED 4 chip, but also a new EN-EL18a lithium-ion battery, which has a CIPA-rated 3,020 shots/charge capacity. (Although Nikon claims they are able to squeeze out a whopping 5,960 shots/charge using their own testing methodology.)

Nikon D4S Review -- Top view

Video. It's not only stills shooters that get performance and handling upgrades with the D4S, video shooters should also welcome some notable improvements. First off, thanks to the new processor, the D4S can now shoot full 1080p HD video at up to 60fps, though maximum clip length in this new mode is limited to 10 minutes at High Quality (42Mbps) and 20 minutes at Normal Quality (24Mbps). For users on professional video productions, the D4S not only has the ability to output clean, uncompressed 1080p60 video via HDMI for use in external recorders, but it can also simultaneously record H.264 video to the internal CF or XQD memory card.

Nikon D4S Review -- Left side view

The D4S also features improved exposure control for video including the ability to use Auto ISO in full manual exposure mode for video recording (ISO 400-409,600). And for users shooting time-lapse and other interval-timed recordings, the D4S has a new auto-exposure feature to smoothly even out unforeseen changes in shot-to-shot exposures and avoid difficult or time-consuming exposure adjustments via post-processing.

Audio. Audio recording capabilities have also been given an upgrade, including selectable audio frequencies, such as Wide Range and Vocal Range, letting the shooter more closely isolate the type or style of sound they want to record. Of course, like the previous model, the D4S includes a headphone jack and mic jack as well as up to 30 steps of audio level adjustment, but unlike its predecessor the D4S lets you adjust microphone sensitivity while recording.

All the small things. As we mentioned above, there are a host of small tweaks and changes to the Nikon D4S.  And while they may not benefit every user of this camera, Nikon has taken suggestions from a variety of photographers and integrated these small features and improvements to make the D4S even more powerful and customizable to your shooting style and needs.

Nikon D4S Review -- Rear view

For photographers who, perhaps, print JPEGs regularly or need a more precise view of the colors when reviewing photos on the rear LCD, the D4S now lets you adjust the color tone of the 921k-dot, 3.2-inch LCD to more closely match studio monitors or just for your personal tastes. The optical viewfinder itself remains largely unchanged with its large, bright 100% coverage and 0.70x magnification.

Nikon D4S Review -- Right side view

Nikon has also modified the mirror movement mechanism to improve viewfinder visibility by absorbing mirror slap, thereby minimizing viewfinder blackout. Now, snapping photos -- especially at 11fps -- won't interrupt the scene in the viewfinder as much, making it easier to keep your subject in view through the OVF.

And speaking of snapping photos, the D4S now makes it simple and fast to toggle between the XQD and CF memory cards (yes, the D4S maintains the XQD/CF pair, not two card slots of the same type). A quick two-button shortcut will switch to the other card.

The last little tweak we'll mention here is for telephoto shooters. Many Nikon telephoto lenses have a focus operation button on the barrel to activate AF or as a memory recall setting to quickly change to a certain focusing distance. The Nikon D4S now has a custom feature in the camera that lets photographers re-program this button to toggle through the different AF modes.

Exterior Design. Moving from the interior out to the exterior, it's fairly obvious that the design of the Nikon D4S is not significantly different from the D4. The camera sports a weather-sealed, full magnesium alloy body that follows the D-series industrial design styling produced in collaboration with Giorgetto Giugiaro's Italdesign firm. However, for the D4S, there have been a few subtle adjustments to the ergonomics and button layout.

Nikon D4S Review -- D4S vs D4 rear view
The Nikon D4S (left) vs the D4 (right): The exterior of the camera is nearly identical aside from a deeper thumb rest grove on the vertical grip and subtle button adjustments.
Nikon D4S Review -- D4S vs D4 front view
The Nikon D4S (left) vs the D4 (right): On the front, again, things are largely unchanged. The D4S does slim down the hand grip some to add more clearance between your hand and the lens.

The grip on the D4S has been narrowed slightly, while the space between the lens and your fingers has been increased slightly for more clearance -- a nice modification when you're shooting with larger, wider lenses and/or, perhaps, in colder conditions and wearing thick gloves. The built-in battery grip contours have also been redesigned with a larger, deeper thumb grip for added comfort.

Availability. The Nikon D4S DSLR is set to be available from March 6, 2014 for a suggested retail price of US$6499.95.

Place your pre-order with a trusted Imaging Resource affiliate now:


Shooting with the Nikon D4S

by Eamon Hickey

Shooter's Report Part I: Unexpected swans

Posted: 04/18/2014

A full-on professional camera like the Nikon's D4S presents a dilemma for a reviewer. Its primary target customers — pro photographers — are already extremely knowledgeable and don't need much help from me. Plus, their concerns are often very specific to their type of shooting. It would be great, for example, if I could prove whether the D4S is the best, or second best, or third best DSLR for autofocusing sports, but that's not gonna happen. To even take a stab at testing such a thing would require several experienced pro sports photographers, a truckload of equipment and months of shooting a wide variety of different top-tier sporting events. Is the D4S the best war photographer's camera or wedding camera or aerial camera? Again, even if I was qualified to judge these things, testing them is beyond the scope of this report.

But pro shooters are not the only photographers who buy pro cameras. Many advanced amateurs buy them, and many more wonder what they might gain if they took the plunge. So I'm approaching this shooter's report partly from that angle: what would you get if you “moved up" to a Nikon D4S from your mid-level or advanced amateur DSLR?

Nikon D4S Review -- sample image
Mute swans on Eastchester Bay. Matrix metering handled this well.
70mm, f/8, 1/400s, ISO 200

Handling. Well, one thing you get is weight. Even though I knew what to expect, I still groaned when I dragged the Nikon D4S out of its box. Obviously, this is just the price you pay for supreme ruggedness, a full-featured integrated vertical grip, an abundance of connection ports, a high-capacity battery and more, all wrapped up in a full-frame DSLR. My brain understands that, but my shoulder isn’t thrilled. In the same box was an also hefty AF-S NIKKOR 24-70mm f/2.8G ED and an AF-S NIKKOR 50mm f/1.4G. Nice.

Judging by feel in the hand, the build quality of the Nikon D4S is unassailable. There's no flex in the body, almost no slop in any fitting or connection, and every part feels solid. Mid-level and advanced DSLRs are typically well built, but they're not constructed like this, so if you need top-tier durability, this is where you find it.

After attaching a lens, I took about 45 minutes to get familiar with all the controls on the Nikon D4S and take a comprehensive tour of its menus. Two themes came through loud and clear to me: versatility and flexibility. As just one example, there are more than 20 possible settings for the autofocus system, including intricacies like whether you want the first shot in a continuous sequence to have a different priority (release vs. focus) than the rest of the shots in the sequence. With more than 30 buttons and dials on its body, many of which are customizable, the D4S also provides direct access to nearly every setting I'd want to change quickly.

Nikon D4S Review -- rear view

After I got the D4S set up to my liking, I took it for a walk in Pelham Bay Park, New York City's largest park, located in the northeastern corner of the Bronx. As I stepped into the woods on the park's edge, I saw that jets on the approach path to LaGuardia airport were flying directly over me, framed in the bare tree branches. I set my aperture and ISO, selected a focus point and autofocused using the AF-ON button — and this is when I first noticed that the roomy body may be a little too roomy. It was a slightly awkward stretch to reach some controls, especially the crucial AF-ON button. I don't exactly have small hands — I’m a 6’2” male who can palm some regulation-sized basketballs — so I think a substantial percentage of photographers will encounter this. It’s not a major issue, but the Nikon DF that I reviewed a couple of months ago, for example, had almost perfect control spacing for me and was a bit more comfortable to use.

Nikon D4S Review -- sample image
In Pelham Bay Park, in the Bronx, under the approach path to LaGuardia Airport.
45mm, f/7.1, 1/400s, ISO 100

Responsiveness. Wandering further into Pelham Bay Park, I stumbled on a pair of mute swans swimming along a lonely stretch of shore on Eastchester Bay. New York state wildlife biologists consider them a nuisance species, but no photographer could possibly agree, so I walked along with them as they made their stately way. As the angles shifted from one moment to the next, the scene changed from looking surprisingly wild to clearly very urban. For about 20 minutes I tracked the swans, looking for serendipitous compositions and experimenting with different apertures.

From previous experience with pro-level cameras, I expected the Nikon D4S to be incredibly responsive, and it didn't disappoint. As I photographed the birds, the D4S focused instantly and the shutter fired with almost zero delay and very short viewfinder blackout whenever I shot. All controls responded instantly. Nikon has spent a lot of time and money engineering every possible millisecond of speed into this camera. If you're not a pro sports shooter or photojournalist, you may not need that kind of split-second responsiveness (I don't), but it's another part of what distinguishes the D4S from lower-level models and justifies its lofty price tag. That said -- and I promise this will be my last whine about this -- by the end of my 3-hour, 5-mile walk, my shoulders were happy to say goodbye to the D4S and the 24-70mm f/2.8G lens I used for most of my shots.

Nikon D4S Review -- sample image
70mm, f/2.8, 1/3200s, ISO 200 [edited in post-processing - click here for unedited version]
Nikon D4S Review -- sample image
62mm, f/8, 1/320s, ISO 400
Nikon D4S Review -- sample image
The matrix metering system did a fairly nice job producing a balanced silhouette here.
70mm, f/10, 1/250s, ISO 100

Metering and a first low light image. When I downloaded my images later, I was also impressed with the exposures (I shot all my images in Aperture-Priority mode). The matrix meter of the Nikon D4S did a good job in many different kinds of light, including heavily backlit shots of joggers and the tricky scenes with snow white swans on dark blue water.

The last images I made on that first shooting day were of the sunset reflecting on Eastchester Bay. I didn't have a tripod and, despite the fading light, I wanted to use f/8 to extend my depth of field from rocks in the foreground to City Island in the background. So I cranked the ISO up to 1250 and shot handheld. The tonal smoothness and lack of noise in these pictures is pretty astounding, considering the ISO setting. I'll do more testing of the low light qualities of the D4S in later installments of this report, but it's no surprise that this camera is shaping up to be a low light champion.

Nikon D4S Review -- sample image
Sunset view of Eastchester Bay, City Island in the background. No tripod and wanted to use f/8, so cranked the ISO to 1250. Remarkable quality at that ISO. This is darkened slightly from the original JPEG -- I had left +2/3 EV exposure compensation in place by accident.
50mm, f/8, 1/80s, ISO 1250 [edited in post-processing - click here for unedited version]

Stay tuned for our next Shooter's Report installment, and in the meantime check out our Nikon D4S Gallery Page to explore these gallery images and EXIF data in greater detail, including super-scoping the higher ISO full resolution images for noise (or the relative lack thereof). And don't forget, you can pit the D4S beside its predecessor or any other camera we've ever tested across the ISO range in our Comparometer.


Nikon D4S Review -- Technical Info

by Mike Tomkins

Sensor. The Nikon D4S is based around a newly-developed, full-frame (or FX-format, in Nikon parlance) CMOS image sensor. Effective resolution is unchanged from that used in the earlier Nikon D4, at 16.2 megapixels. Total resolution of the sensor, which has dimensions of 36.0 x 23.9 millimeters, is 16.6 megapixels. Unlike many current DSLRs, the D4S' sensor still sits beneath an optical low-pass filter that subtly blurs incoming light, helping to reduce the frequency of moiré and false color artifacts.

In the sensor's native 3:2 aspect ratio, the Nikon D4S outputs images at resolutions up to 4,928 x 3,280 pixels. There are also two cropped 3:2 aspect ratio modes which yield an effective 1.2x or 1.5x focal length crop, and a 5:4 aspect ratio mode which uses the full height of the image sensor, but trims the sides.

Processor. In place of the EXPEED 3 image processor used in the D4, the Nikon D4S is based around a next-generation EXPEED 4 processor. The company says that the newer chip has 30% greater performance, and allows for better noise-reduction processing thanks to updated algorithms.

Sensitivity. A significant difference from the earlier camera can be found in the sensitivity range of the Nikon D4S, backing up the claims of improved noise processing. The new camera now offers a standard ISO sensitivity range of 100 to 25,600 equivalents, a full stop above the D4's range, which was curtailed at ISO 12,800 equivalent.

It's still possible to extend the ISO sensitivity range at both ends, with the D4S now able to encompass everything from ISO 50-409,600 equivalents. At the lower end of the range, that's unchanged from the D4, but the upper limit is again a full stop above the earlier model's ISO 204,800 limit.

The D4S also offers an Auto ISO function which takes into account the mounted lens type, automatically selecting higher shutter speeds when the attached lens has a longer focal length. It's possible to manually skew the Auto ISO function towards faster or slower shutter speeds.

Performance. Nikon has also improved burst shooting performance of the D4S compared to that of its predecessor. The increase -- from 10 frames per second in the earlier camera to 11fps in the new model -- is modest, but certainly worthwhile for sports shooters. (Note that you're now getting autofocus and autoexposure adjustments between shots at this rate -- the D4 could manage 11fps, but only if you locked both variables from the first frame.)

The burst depth has also gotten a subtle improvement. Previously the D4 was rated as good for 200 frames when using JPEG Basic compression. Now, the Nikon D4S is said to be good for 200 JPEG Fine frames. Information on raw burst depth wasn't available at press time, and of course all these figures are manufacturer ratings; we'll have to get the camera in the lab before we can provide in-house figures.

Optics. Just like its predecessor, the Nikon D4S features a Nikon F-mount with autofocus coupling and contacts. As you'd expect, it's compatible with almost every F-mount lens made since 1977, although some lens types will have a few limitations.

Displays. On the rear panel of the Nikon D4S is a 3.2-inch diagonal LCD panel. It's the same size used on the D4, and resolution is unchanged too, at 921,600 dots. (That equates to 307,200 pixels in a 640 x 480-pixel VGA array.) Also unchanged is the wide 170-degree viewing angle both horizontally and vertically, and the 100% frame coverage.

The D4S's LCD now includes a function allowing the user to adjust color tone, though, a handy addition to the feature set of the earlier camera. You can also adjust brightness in five steps.

Of course, the D4S also has both top-panel and rear-panel monochrome status displays, just as found in its predecessors.

Viewfinder. The Nikon D4S also retains its predecessor's eye-level pentaprism viewfinder, but while the viewfinder itself is unchanged, a difference in the reflex mirror mechanism should make using it rather more pleasant. The new mirror mechanism reduced viewfinder blackout time, meaning that the viewfinder view is interrupted for a shorter period during exposures. That should make tracking moving subjects easier.

Viewfinder coverage is still 100% when used in uncropped FX 3:2 aspect ratio mode, and 97% when in the 1.2x or DX cropped modes. For the cropped FX 5:4 aspect ratio mode, coverage is 100% vertically, but only 97% horizontally. When shooting in modes other than the native FX-format 3:2 aspect ratio, a translucent LCD in the viewfinder of Nikon's D4S partially masks the inactive portions of the frame.

The viewfinder has 0.7x magnification at 50mm and -1 diopter, an 18mm eyepoint, and a diopter adjustment range of -3 to +1m-1, all unchanged from the last several generations of Nikon pro flagships.

Focusing. The D4S is still based around Nikon's 51-point autofocus module, the Advanced Multi-CAM 3500FX, but that doesn't mean there's been no change -- far from it. The company says that its autofocus algorithms have been "thoroughly recalibrated" for better performance, and the AF Lock-on function should now deal with focus interruptions more quickly, restoring focus to your intended subject.

The Nikon D4S also sports a new Group Area AF mode, in which you pick an autofocus point, and the four surrounding points are also activated. It's similar to Canon's AF Point Expansion function, and should help to keep focus locked when panning to follow moving subjects. Essentially, your chosen center point is favored for focus determination, but if the focus distance for that point suddenly changes while remaining little changed at an adjacent point, the D4S will assume you've accidentally slipped off your subject, and switch points automatically.

The Multi-CAM 3500FS sensor has a working range of -2 to +19 EV (ISO 100, 20°C/68°F). Of the 51 points arrayed across the sensor, 15 points located at the center are cross-type, sensitive to both horizontal and vertical detail, and nine of these work at apertures up to f/8 with compatible Nikkor lenses mounted on the TC14E or TC17E teleconverters, while the centermost point works at up to f/8 with compatible Nikkor lenses and the TC20E teleconverter. (The remainder work as cross-type sensors to f/5.6 or lower.)

As well as using the full 51 points of the AF array, it's also possible to select single-point, 9-point, or 21-point modes.

Shutter / Mirror. The Nikon D4S offers shutter speeds ranging from 1/8,000 to 30 seconds in steps of 1/3, 1/2, or 1 EV, as well as a bulb position, all unchanged from the D4. Flash x-sync is still at 1/250 second. The shutter unit still has a rated life of 400,000 cycles, and interestingly, we've learned that this rating was determined by testing the camera in-situ in a camera body, rather than on a workbench.

As noted previously, the D4S has a new mirror mechanism that reduces bounce and viewfinder blackout time. Nikon hasn't provided any figures for the scope of the improvement, but it should make tracking of moving subjects easier.

Exposure. Also retained is the Nikon D4's exposure metering system. The Nikon D4S determines exposures with a 91,000 pixel RGB metering sensor. Thanks to the high resolution and the presence of color information, the system can recognize and account for human faces when performing metering, even when shooting using the optical viewfinder.

Metering modes include 3D Color Matrix Metering III, Color Matrix Metering III, Color Matrix Metering, center-weighted (which either gives a 75% weight to an area of 8, 12, 15, or 20mm at the center of the frame or averages the entire frame), and spot (which meters on a 4mm / 1.5% circle centered on the selected focus point.) The precise matrix metering mode available depends upon the mounted lens type.

The Nikon D4S provides an exposure compensation range of -5 to +5 EV, set in increments of 1/3, 1/2, or 1 EV. Additionally, it's possible to bracket anywhere from two to nine frames, in steps of 1/3, 1/2, 2/3, or 1 EV, both for flash and available-light exposures.

White balance. Nikon says that its white balance calculations have been further refined in the D4S, ensuring greater accuracy. A spot white balance function is available, and as well as two Auto, six Custom positions, and Kelvin, there are a selection of twelve preset modes. White balance presets include incandescent, fluorescent (7 types), direct sunlight, flash, cloudy, and shade. White balance can also be bracketed with the D4S saving two to nine copies of each image with varied white balance.

Flash. The Nikon D4S includes both a standard flash hot shoe with sync and data contacts and a safety lock, and a sync terminal with locking thread. i-TTL flash exposures are metered using the 91,000 pixel metering sensor. As you'd expect, the D4S supports Nikon's Creative Lighting System. The SB-910, SB-900, SB-800, or SB-700 Speedlights can be used as a master flash, the SU-800 Wireless Speedlight Commander as commander, and the SB-600 or SB-R200 Speedlights function as remotes.

Creative. The Nikon D4S can still shoot time-lapse photography in interval mode, and has a time-lapse movie function which can assemble the results into a movie for you. However, the company says that it has improved the interval mode with an exposure smoothing function that more gradually changes exposure across frames, avoiding the flickery look that can result when your subject's brightness changes from the overall trend for a few exposures here or there.

As you'd expect, the Nikon D4S also includes the company's Active D-Lighting function, which tweaks the tone curve for more balanced exposures. The D4S's Active D-Lighting function includes one additional strength level beyond those in the D4, which is Extra High 2. Active D-Lighting can be bracketed, with anywhere from two to five frames saved with the ADL strength varying between frames.

The D4S also includes Nikon's Picture Controls function, which offers six presets -- Standard, Neutral, Vivid, Monochrome, Portrait, Landscape -- and the ability for the user to customize these and port settings between camera bodies.

Tilt sensor. As with its predecessors, the Nikon D4S includes a dual-axis level sensor, used to provide a Virtual Horizon function that helps ensure level horizons and parallel verticals. The rear-panel LCD can show a gauge similar to an aircraft attitude indicator, while the viewfinder and top-panel LCDs can be used to show side-to-side roll.

Video. Good news, video shooters. The Nikon D4S boasts further improvements to its video mode, beyond those made in the previous D4. Thanks to the more powerful EXPEED 4 processor, it can now capture Full HD (1080p; 1,920 x 1,080 pixel) video at up to 60 frames per second (50fps for PAL), where its predecessor was limited to 1080p at 30 fps. Reduced frame rates of 30, 25, and 24p are still available, as well as a reduced resolutions of 720p (1,280 x 720 pixels) at either 60 or 50 fps, and 640 x 424 at 30 or 25 fps.

Videos are recorded using H.264 / MPEG-4 AVC format compression with linear PCM audio, and you can also still output an uncompressed, 8-bit, 4:2:2 Full HD live view feed via the D4S's HDMI port, allowing it to be recorded using an external device and/or routed to an external monitor. However, you can now opt to do both at the same time -- record H.264 video to the flash card, and output uncompressed HDMI, getting the best of both worlds.

Video can either be shot using data from pixels across the entire width of the image sensor in FX mode, or with either a 1.5x (DX-format) / 2.7x focal length crop, taking data from the center of the imager, without affecting the video resolution.

The Nikon D4S allows shutter speed, aperture, and ISO sensitivity to be changed during recording, as required to adapt to changes in ambient lighting or yield the desired cinematic effect. And like its predecessor, a Power Aperture function is included, allowing smooth and stepless aperture control using the Preview and Function buttons on the camera's front panel. However, unlike the earlier model, you can also opt to control shutter speed and aperture manually, but have the camera control ISO sensitivity so as to retain the metered exposure. (If subject brightness changes, the ISO sensitivity will gradually change so as to account for this.)

There's still full-time contrast detection autofocus capability, operating either in face detection, wide area, normal, or subject tracking modes, as well as the ability to focus manually.

Maximum clip length is 29 minutes 59 seconds at Normal quality and 20 minutes at High quality except for the new 1080p60/50 mode, which is limited to 20 minutes at Normal quality (24Mbps) and 10 minutes at High (42Mbps). Although there's a dedicated Movie record button, it's possible to configure the D4S to use the Shutter button to start and stop recording, allowing a greater range of accessories to control recording.

Audio levels for the built-in monaural microphone can be adjusted automatically or manually in a 30-step range, while external stereo mics have a 20-step adjustment range. The levels for either can be monitored on the camera's LCD display, and the levels adjusted during capture. There's a wind cut filter, as well, and this too can be enabled or disabled during capture. You can also now select between various frequency ranges for capture, such as Wide Range and Voice Range, so as not to pick up untoward noises outside of your intended capture range. Additionally, the Nikon D4S includes a standard 3.5mm stereo audio output, allowing headphones to be connected to the camera for live monitoring of captured audio.

One last video feature of note is the ability to select a frame rate and shooting interval for time-lapse photography, and then have the results saved as a video that plays back at speeds ranging from 24x to 36,000x. (And as already mentioned, exposure changes in time-lapse movies are now made more gradually.)

Environmental sealing. As you'd expect for a pro-level Nikon body, the Nikon D4S's tank-like magnesium alloy body is fully sealed and gasketed throughout, to protect against moisture, dust and dirt, and electromagnetic interference.

Dust reduction. Of course, as an interchangeable-lens camera, the lens mount itself is a potential entry-point for dust, and the D4S includes a dust removal function achieved using vibration of the optical low-pass filter. The Nikon D4S can also capture a reference image which determines the location of dust on the image sensor, and can be used to retouch photos to remove this dust, using Nikon's optional Capture NX 2 software.

Connectivity. Just like its predecessor, the Nikon D4S has an uncommonly wide range of external connectivity even by pro SLR standards. Connections include USB High-Speed data, a Type-C mini HDMI high definition video output, and an RJ-45 wired Ethernet port. However, where the Ethernet port of the D4 was 100Base-T compatible, that on the D4S is now a 1000Base-T port -- also known as Gigabit Ethernet, and capable of 185Mbps transfer. That's more than triple the rated speed of 60Mbps provided by the earlier camera.

The D4S also includes a ten-pin remote terminal (also used to attached compatible GPS devices), a 3.5mm stereo microphone jack (with support for plug-in power), and a 3.5mm stereo headphone jack (for monitoring audio during video capture).

Wireless file transmitter. The Nikon D4S is also compatible with the WT-5A wireless file transmitter. These allow images to be transferred directly from the camera to an FTP server or computer on the wireless network, and transfer can be initiated automatically or manually. The WT-5A draws its power from the camera body via a port beneath the strap lug on the left side of the camera body, and compared to the WT-4A -- with which the D4S is also compatible -- offers higher-speed 802.11n compatibility, linked release of up to ten cameras from a single camera body, and remote operation using Nikon Camera Control Pro 2 software.

GPS. As mentioned previously, the Nikon D4S can be connected to a GPS receiver, allowing geotagging of images as they're captured. As well as Nikon's own GP-1A hotshoe-mounted GPS receiver, the D4S is also compatible with NMEA0183 version 2.01 or 3.01-compliant GPS receivers, which can be connected to the camera using an optional MC-35 GPS adapter cord and the receiver's own connector cable with 9-pin D-sub connector.

Storage. The Nikon D4S has dual flash card slots, and can be configured to write images simultaneously to both cards, write raws to one card and JPEGs to the other, or use one card as primary and the second as an overflow when the first card is filled up. And like its immediate predecessor, only one of the slots accepts CompactFlash cards (Type-I only, including UDMA cards).

The other slot accepts the still-rare XQD-format memory cards, which were introduced by the CompactFlash Association in early December 2011. To date, they've still been adopted in the camera world solely by Nikon, and the D4S is only the second camera to offer support for them.

A nice, new touch is that you can now switch between cards as you're shooting with a two-button shortcut. Want to save just particular subjects or shot types to one card, and the remainder to the other? Now you can.

The D4S can write either 12-bit or 14-bit raw images with lossless or lossy compression, or completely uncompressed. It also has a new small, 12-bit raw file size, which saves with one quarter the pixel count (2,464 x 1,640 pixels) and half the file size of a standard 12-bit raw file. It can also save images as RGB TIFF files, Baseline-compliant JPEGs at 1:4, 1:8 or 1:16 compression levels, or as both raw and JPEG formats at the same time. A nice plus for wire service photographers is that the D4S can generate IPTC data in-camera, instead of at download time, streamlining the tagging process.

Power. The Nikon D4S draws power from a rechargeable EN-EL18A lithium-ion battery, rather than the EN-EL18 pack of its predecessor. The new battery is the same size as that used in the D4, but rated for significantly greater battery life in the new camera. CIPA testing suggests that the EN-EL18A battery will deliver up to 3,020 shots per charge in single mode, up from 2,600 shots with the EN-EL18 in the D4. And while doing so doesn't comply to CIPA standards, Nikon says that switching to continuous drive mode will allow 5,960 shots on a charge.

The D4S's battery is charged via the Quick Charger MH-26a, and an EH-6b AC Adapter can be used to power the D4S, requiring the EP-6 Power Supply Connector.


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