The following image shows how the modified camview-emc looks like (HD5000 webcam, distance 100mm from the metric ruler)
HD5000 fixture described here: [[1]]
The control panel has been modified to provide direct zoom and focus control.
camviuew-emc material can be found here Axis Embed Video
[DISPLAY] .. EMBED_TAB_NAME = Camera EMBED_TAB_LOCATION = ntb_user_tabs EMBED_TAB_COMMAND = ./camview-emc-f1oat.py -v 1280x720 -C camview.cfg -g cam.ui -H campins.hal -w {XID}