Nikon D90 Manuals page 13

xii Visual Tour
Sub-Command Dial: This dial is used to change various settings found on
the LCD panel on top of the camera .
Autofocus Assist Light: Even though the name refers to autofocusing, this
light is actually used for a few functions: (1) lighting up subjects to help the
lens focus, (2) indicating the self-timer is active, and (3) lighting up before the
flash fires to reduce red-eye.
Microphone: The microphone is used to record sound while recording a
video.
Infrared Receiver: This dot is what receives the signal from a wireless
remote.
Lens Release Button: Use this button when you want to remove or change
the lens. Press the button and hold the camera in one hand. With your free
hand turn the lens to the left to detach it.
Depth-of-Field Preview Button: Look through the viewfinder while you
press and hold this button and you'll see a preview as to how much of your
subject/scene will be in focus.
Function Button: Used as a shortcut button to access a selected feature.
INSIDE THE CAMERA
If you take off the body cap on the front of the camera, you'll see a mirror inside. The mirror
bounces the light up into the viewfinder, which is what lets you see what the lens sees. The sen-
sor that records your photograph is located behind the mirror.