Hi John, It might be a good idea to look at the code I originally developed to see what you might learn from it. Here's the link:

invent.kde.org/dmsummers/kstars/-/commit...898eaca8e0dc9891582f

Note that the main section of code (focusCompensator.cpp) is collapsed by default due to its larger size). Just uncollapse. Hopefully a look will answer multiple questions. If it's still not clear what was going on, I'm happy to discuss. You can send me a PM or email to This email address is being protected from spambots. You need JavaScript enabled to view it.

Cheers, Doug

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