1. The camera modes

2. 
Mode P (programmed
auto): The camera
automatically adjusts
aperture and shutter speed
for optimal exposure
But the photographer
can choose from
different apertures or
shutter speeds.

3. 
Mode S (shutter-priority auto): The photographer
chooses the shutter speed and the camera
adjusts aperture.

4. 
Mode A (aperture-priority auto): the
camera selects automatically the
shutter speed and the photographer
selects the aperture.

5. 
Mode M (manual): In this
mode the photographer
selects the shutter speed
and the aperture.

6. 
Mode M (manual): In this
mode the photographer
selects the shutter speed
and the aperture.