Olympus E-20N - Manual (Page 66)

64
Using Autofocus (AF)
When autofocusing operates, the camera focuses the subject automatically. When the
subject is in focus, the AF correct mark in the viewfinder lights.
1
Set the focus mode switch to AF
(autofocus), as shown by the arrow
in the illustration on the left.
2
Look through the viewfinder and
point the camera to cover the
subject with the AF target mark in
the center of the viewfinder.
If you are using the monitor to compose
the picture, make sure that the subject is
centered in the monitor.
3
Half-press the shutter button.
When the subject is in focus, the camera
beeps and the AF correct mark in the
lower left corner of the viewfinder lights.
When the AF correct mark blinks. (
➞ 66)
4
Fully-press the shutter button to
take the picture.
How autofocus operates
Infrared light emitted from AF port is used to estimate the approximate distance from the camera to
the subject. This information is used to roughly focus the image of the subject by moving the lens,
and then more precise focusing is conducted by the part of the CCD that receives the light from the
lens. When the subject is in focus, the AF correct mark in the viewfinder lights.
However, with some subjects, dark subjects or subjects of low contrast, the CCD may not operate
accurately, so focusing is conducted only with the infrared light emitted from the AF port.
With the macro mode mark
or conversion lens mark displayed in the control panel, focusing is
performed only with the CCD.
1
AF
MF
AF port
CCD
Move the lens to a position for focus based on
the light passing through the lens (at 2nd
stage, the AF correct mark in the viewfinder
lights).
The infrared light emitted here
meters the distance to the subject
(1st stage focusing).
1
2
AF target mark
Focusing is conducted on the
subject covered by this mark.
When the subject is in focus, the camera
beeps and the AF correct mark lights.