What is autofocus(power-focus)?
Autofocus can also be called power-focus because a
lot of times a computer uses a miniature motor to
focus on an image automatically.
What automatic features are
included and what two types are
Automatic film advance
Passive (more expensive)
Some have both
Infrared signal uses
Amount of infrared light reflected from the
Makes flash photography much easier
Uses sound waves to tell the distance
Has problems like
1. It gets confused when you take a picture of light
2. Black surface my absorb the infrared beam.
3. It may focus on something in front of the object
you are trying to capture.
Often found in single-lens cameras.
Uses computer analysis of the image to tell the