Many thanks to Bobn2 and colleagues for moving so quickly on this. I'll post my spreadsheet link again
The link below provides access to two spreadsheets that can be used as an aid to setting up your RX10 IV. I've no idea if they are of any value to anyone else, but they certainly helped me to get a better understanding of the many options that Sony provide. Anyway, they are free for anyone to download and use
There's an ODB version and a Microsoft Excel version. Right click on the appropriate file to download
All thoughts/comments welcome
Tim
drive.google.com/drive/folders/1LnkhRDHzkVCkHH5wAQVS_ClU-RbWb5zs?usp=share_link