Olympus IS-1 User Manual download pdf (Page 56)

Autofocus (AF)

The Autofocus (AF) mechanism automatically

adjusts focus by measuring the distance-to-subject.

Focusing is accomplished by a TTL (through-the-

lens) phase-difference detection system. More

simply, an AF sensor catches the light reflected

off of the subject, calculates the distance, and

activates the lens to focus. The IS-1 AF system

is particularly advanced, because it even works in

the dark by using an infrared beam of light.

Autofocus is designed to focus on whatever

appears in the center of the viewfinder. If you

wish to position your subject outside the

center of the frame you can use the focus lock

(see p. 21). This will also lock the proper

exposure (AE lock).

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