I finally managed to get the SBIG ST10 guider connected:

Apparently there is no need for a second optical train for the second (guider) camera chip. (and strangely no longer need to select SBIG-STI for the guider camera).
I changed the profile to both main and guider = SBIG-CCD
When I then also select the primary optical train under the guiding tab in EKOS, the screen is no longer greyed out and I could capture guiding chip images.

Tom

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