Body Elements

The D7100's viewfinder offers 100% coverage and is framed with a rectangular eyecup, like the D600 and D300S.

There's a diopter adjustment wheel at upper-right. Inside the viewfinder you'll see a new OLED display for shooting and exposure information, which offers excellent clarity.
The D7100's built-in flash has a guide number of 12 meters at ISO 100 and can also act as a wireless 'commander' for up to two groups of Nikon Speedlight flashguns.
The flash is is released using the uppermost button in this image. Below the flash button sits the BKT button, which is used to set automatic exposure bracketing.

Also visible in this view is the front IR window, one of two on the D7100 (the other is on the rear) which allows the camera to be triggered with an infra-red remote release.
There's a bright LED autofocus illuminator, that the camera will automatically activate when the light is too low to focus. It can be disabled in the menus, if you prefer.

Switching the camera to its 'Quiet' shutter mode will also temporarily disable the AF illuminator, along with the focus confirmation beep.
The D7100's exposure mode dial gives access to the camera's exposure modes, including PSAM, Auto, and two programmable 'User' positions for quick switching between sets of shooting parameters. At the base of this dial is the drive mode dial, where you'll find the continuous and quiet release modes, self-timer and mirror lock-up.

Both dials have locks to prevent accidental rotation.
Easy to miss, this tiny screw is the business end of an in-camera AF motor which drives the autofocus in non-AF-S lenses. This makes the D7100 significantly more compatible with Nikon and third-party legacy optics than DSLRs further down Nikon's lineup.
The D7100 inherits Nikon's simpler combined AF/MF switch and AF mode control found on their recent DSLRs. This switch has two positions - MF and AF, with AF mode and AF Area mode options selected by holding in the button at its hub and rotating the D7100's control dials.
The D7100's live view control is exactly the same as on the D600 and D800, and comprises a live view activation button with a collar-type switch to move between still and movie live view modes. In movie mode the view on the LCD is cropped to preview the field of view captured during video shooting.
The D7100 has a video capture mode, and just like other recent Nikon DSLRs, it offers a direct movie shooting button on its top-plate for quick and easy movie capture once you're in video live view mode.
Two small grills in front of the hot shoe conceal the stereo microphones. The hotshoe can be used to add a variety of accessories, including flashguns and Nikon's WR-1 wireless transceiver.
On the side of the camera are ports to connect a stereo microphone, headphones, plus USB 2.0 and HDMI devices. An accessory port can be used for Nikon options like wireless remote controllers, a GPS and Wi-Fi mobile adapter.
The D7100 uses the same EN-EL15 battery as the D7000, D800 and D600, making it much more convenient to use the D7100 as a second camera alongside any of these models. According to Nikon, the battery has a CIPA rating of approximately 950 shots in single release mode.
The D7100 features dual slots for SD/SDHC/SDXC memory cards. If two cards are installed, it is possible to set the secondary card as overflow storage or backup. You can also save JPEGs to one card and Raw files to the other.
The tripod socket is positioned in-line with the lens axis.