I think I have found my solution.. for me the INDI-Webcam does not provide all the matching configuration settings for the IMX290 chip.. The "V4L2 CCD" driver is much better and provides all the configuration items needed. By comparing the output from

v4l2-ctl --list-formats-ext -d /dev/video0

and

v4l2-ctl -L

that show all the supported combinations of the various parameters I think (touch wood) that I can get a reliable capture at whatever pixel dimensions I wish for.

I have noticed that after running the output of v4l2-ctl suggests only 30fps is supported for all the pixel sizes.. but reboot the PC and the 15, 20, 25, 30 fps speeds get restored. Other than that wiki.openastrotech.com/Knowledge/Guiding seems to show how PHP2 is configured for guiding so waiting now for good conditions!

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