Aperture controls the depth of field in a photograph by adjusting the size of the opening through which light enters the camera. A smaller aperture number means more light is let in, resulting in a shallower depth of field, while a larger number allows less light and a greater depth of field. Many photographers prefer using aperture priority mode to creatively control how their photographs look by adjusting the depth of field.

1. Aperture
Can control depth of field, the distance of definition in a photograph
The ability to control the depth of field in a
photograph offers you the chance to convey
mood, draw the viewer’s attention to a
particular point of interest in the composition
and influence colour and tone.
Many photographers keep their cameras almost
permanently set to aperture priority as a
creative decision to how their shots will look.

2. Using a 50mm lens I thought I'd see how some real narrow D.O.F. compares with real wide D.O.F. The image on
the left was shot at f/1.4, the one on the right stopped all the way down to f/16.

3. Smaller number – the more light gets in
Bigger number – less light gets in

4. Shutter Speed
Speed is the amount of time that the camera's shutter remains open and exposes the camera's
sensor
• Speed is measured in fractions of a second for
example 1/10 is one tenth of a second
• Think about it logically, you need more time to
expose the picture when their is less
light available and, you need less time to
expose the picture when their is more
light available.

6. In order to "play" with shutter speed, you will have to, again, set your camera
to one of the manual modes. This time I suggest "TV" (time value) for Canon
and "S" (shutter priority) for Nikon cameras. This dial setting will allow you to
try out different shutter speeds, but the camera will still have control over
aperture

7. ISO
Deals with the cameras sensitivity to light
• The higher the ISO, the more sensitive the
camera is to light.
• The lower the ISO, the less sensitive the
camera is to light.