QNAP Security VioStor NVR (Version: 4.1.2) - Manual (Page 84)

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Digital zoom:
Select a channel and click this button to enable the digital
zoom function. This function can also be enabled by right
clicking the display window of the PTZ camera. Press
button to zoom in or button to zoom out. You can
also use the mouse wheel to operate the digital zoom function.
Zoom out/zoom in： ： ： ：
If the PTZ camera supports optical zoom, you can press
to optically zoom out or button to optically
zoom in. When digital zoom function is enabled, you can
press to digitally zoom out or button to
digitally zoom in.
Select and configure PTZ camera preset positions:
Select and view the preset positions of the IP camera from the
list. For some camera models, you can configure PTZ camera
preset positions on the monitoring page. For more
information about the compatibility of PTZ cameras for preset
positions configuration, please visit
http://www.qnapsecurity.com/faq.asp . For other PTZ
camera models, please refer to the user manual of the IP
camera.