Last message from me on this topic...

I ranĀ  AstroPi3 to set-up my 64-bit OS raspberry and after that the magnification problem I mentioned in my earlier posts went away. It might have been something specifically in that script or it might be that - as part of the script - it does an 'apt update' and an 'apt upgrade' and with a new beta of the 64-bit OS just released on April 9, it may have picked up a fix from that.

I don't really know, but all I know is it all works now so I'm happy.

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