Aperture stops explained and demonstrated.
More on Aperture:
DOF & aperture made simple: http://www.youtube.com/watch?v=JHjkeNnGe74
Get out of AUTO mode! Exposure explained: http://www.youtube.com/watch?v=1YcJrjSQ8eM
Understanding depth of field: http://www.youtube.com/watch?v=LUv6RHP3OZI
Bokeh, DOF & sensor size: http://www.youtube.com/watch?v=Es7gK3V22hM
The power of Bokeh: http://www.youtube.com/watch?v=qabZy4SNX1c
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