View Finder

A view finder is a small window that a photographer looks through to see the picture he wants to take as the camera sees it and will capture it. The process works through a system of mirrors set up to reflect the image.

Shutter and Control Buttons

The camera's shutter is a window that opens and closes when the shutter control button is depressed. The settings on the shell of the camera determine how long the shutter will stay open which determines how much light is let in. Controls for the speed of the shutter and the amount of light let in are also in the shell.

Flash

For more light the camera body most often has a built-in flash and may also have a hot shoe mount that provides the electronics used to operated an external flash attachment.

Lens Ring Mount

A camera body comes without lenses. For interchangeable lenses the camera body has a lens ring mount that is a metal ring, containing electrical contacts, that allows a lens' controls to be attached to the controls within the camera body.

Battery Compartment

The camera body controls are operated with battery power. The body has a compartment to hold the battery. The batteries are different sizes according the camera make and size. Usually rechargeable batteries are used in the compartment.

Film Housing or Memory Card Slot

Cameras using film have a film housing that provides the electronics or the winding device to advance the film. Today's digital SLR cameras use memory cards instead of film and the camera body has a slot to accommodate the type of memory card that the camera uses.

Source:

speed of the shutter

Resource:

Lens mount