Dahua D-IPC-HDBW3441R-ZS-B Schnellstart-Handbuch - Seite 19
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Quick Start Guide
3.3.6 Adjusting Focal Length
It doesn't have to adjust focal length for motorized vari-focal lens. For manual vari-focal lens, first it
has to adjust focusing lever and then the zoom lever. It needs to tighten the focusing lever after
adjustment is completed.
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