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Thanks for your answer! I'm using usb_cam.

I'm running Ubuntu on VMware and guvcview is running very unstable. But when turning off the autofocus, the webcam is not autofocussing anymore. When running the v4l2ucp Node (I guess "rosrun v4lucp v4lucp" is correct) I get errors for Exposure, Auto. And a similar result with uvcdynctrl. Why does this error occur? Is it possible to change the parameters dynamically with this node?

But, you are right, the launch file is overwriting the values I set with rosparam in advance. When I turn the autofocus off in the launch file, the camera is not autofocussing anymore. So this problem is solved here.

Thank you so much! Great answer!