Panasonic HX-DC1 Owner's Manual page 58

HINT
When recording videos at a high magnification
i When recording videos at a high magnification, a moving subject or
moving camera can cause camera shake, resulting in a distorted playback
image. This phenomenon is due to the characteristics of the MOS sensor
and is not a malfunction.
i It is recommended that you use a tripod to stabilize the camera when
recording videos at a high magnification.
i When the digital zoom is used, the picture quality becomes grainier as the
magnification increases.
i See page 186 regarding zoom magnification.
When the ZOOM RANGE button is pressed... (HX-DC1)
i The magnification is approximately doubled (double-range zoom). Press
the button again to return to normal magnification.
i The [W] icon is shown on the Recording Screen during normal
magnification, and a [T] icon on the double-range zoom Recording Screen.
i Double-range zoom is effective only when recording video. Photos are
recorded without enlargement.
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VQT3M88
ZOOM RANGE
button