78
Most High end cameras have many cross point areas which may be
combined together to form very elaborate autofocus set ups. The
Panasonic Lumix FZ200 has, as I understand it, just one central cross
point focus area.
23 Area Method. This is the default method as used in the iA mode. It
uses 23 points for autofocus distributed over the imaging sensor.
When this mode is selected and the shutter button is half depressed the
camera will attempt to analyse the image on the sensor to drive the auto
focus element of the lens to the correct position.
It will indicate by green rectangles on the display the areas it believes
have the highest contrast and, therefore, are in focus.
If it is not the area you require then if recomposing the shot doesn't give
the desired focus target you may need to select the 1-area method
described later. The aspect ratio for the autofocus detection is the same
as the aspect ratio for the image.
Indication of the autofocus points
Note in the above illustration the two areas which the camera has
defined as the areas which are in focus and the green confirmation of
focus indicator top right. Nine such areas are made by the camera from
the 23 area points, which ones illuminate will depend upon the relative
distances the various elements of the subject are to the camera.
Where this method may fail is in situations where the subject and
background have similar contrast, the system will not be able to
determine precisely what you are trying to set as the subject with a result
that the wrong area of the image is selected.
To Next Page
Loading...
