Here is Nikon's F-mount, providing the D7100 with 80 available FX and DX NIKKOR lenses. This is one of the largest collections of lenses available for any camera, providing you with several lenses that will work for whatever situation you will encounter.
Capturing the images for the D7100 is a new, specially designed 24.1-Megapixel DX-format CMOS imaging sensor. Designed without an optical low pass filter, the sensor is the sharpest in the Nikon DX lineup. The image sensor is capable of cleaning itself using ultrasonic vibrations.
Combining this with the EXPEED 3 image processor gives the D7100 the ability to capture up to 6fps for up to 100 images at its full 24.1-Megapixel resolution (although, we never achieved 6fps during our tests). It is combined with an autofocus system featuring 51 focus points, 15 cross-type sensors and a RGB sensor that evaluates every scene. This sensor also makes possible some of the special features like full-time autofocus during video recording or the the camera's face priority mode.
The D7100 also features a small built-in flash unit. This can be very useful with a range of up to 12 meters or 39 feet at ISO 100. While it does not compare to any of the external speedlight flash units, it can help in close, low-light situations or as fill light outdoors.
Composing your images is accomplished with the eye-level pentaprism optical viewfinder. It shows approx. 100% field of view both horizontally and vertically so there is no guessing on what the final image will look like. It also features diopter adjustment of -2.0 to +1.0m¯¹, a viewfinder eyepoint of 19.5mm (-1.0m¯¹), and a 0.94 magnification.
On the top left of the camera you can see the mode dial, which includes the typical PSAM options, along with two user defined settings and a full Auto shooting mode. There is also a full set of scene modes and set of custom effects, including night vision, selective color and miniature effect. To the right you can see the camera's hot shoe, for adding an external speedlight or external microphone. In front of the hot shoe is the camera's built-in stereo microphone.
To the right of the pop-up flash unit you will find the LCD control panel, which lists all of your camera settings in the same way as the older SLR cameras. Above that are controls for metering/formatting, movie record button, exposure compensation and the power switch which is coupled around the shutter release. On the front you can see one of the control dials as well.