Olympus IS-1 - Manual (Page 15)

*While looking through the viewfinder, aim the
camera at the subject.
*Use the zoom (T/W) button to adjust the
size of your subject in the frame (Telephoto
or Wide angle).
—Press the "T" (Telephoto) on the zoom button to
zoom in. (The maximum focal length in the "T"
position is 135 mm.)
—Press the "W" (Wide-angle) on the zoom button
to zoom out. (The minimum focal length in the
"W" position is 35 mm.)
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