The camera

camera obscura- its like a dark chamber.
electromagnetic spectrum- is the range of all possible frequencies of electromagnetic radiation.
visible spectrum- is the portion of the electromagnetic spectrum that is visible, it can be detected by the human eye.
Photographs- is an image created by light falling on a light sensitive surface.

Aperture- it is a hole or an opening through which light travels.
shutter- is a common term used to discuss exposure time.
exposure- is controlled by shutter speed.
depth of field- its the distance between the nearest and fastest objects in a scene that appear acceptably sharp in an image.
F- stop- its the value that indicates the size of the lens aperture used during the taking of a photograph.
focal length- the focal  lenght of an optical system is a measure of how strongly the system converges or diverges light.

  the buttons are:
SET
zoom in and zoom out
the "up" "down" and "side" buttons
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