==v4l2-ctl==
===Installing===
*<codesyntaxhighlight lang="bash'>sudo apt-get install v4l-utils</code>
===Using===
*set max zoom with c920:
**<codesyntaxhighlight lang="bash'>v4l2-ctl -c zoom_absolute=200</codesyntaxhighlight>
*set max tele with c920:
**<codesyntaxhighlight lang="bash'>v4l2-ctl -c zoom_absolute=100</codesyntaxhighlight>
*list all controllable settings:
**<codesyntaxhighlight lang="bash'>v4l2-ctl --list-ctrls<codesyntaxhighlight>
==guvcview==