Hi,
Get correct focus is always tricky, sometimes the automatic focus function works, sometimes not. Not uncommon that I spend one hour to find the optimal focus point. Now I have done this excel sheet that could assist me. It's still in development process.
I have added a new excel sheet, this one will calculate where the best focus is from a table of your focus positions and FWHM numbers. It fit a second degree polynomial to your numbers and find the focus point even if it's between your numbers.
If you have temperature compensation activated it's better to deactivate it during this process.
http://www.astrofriend.eu/astronomy/...ons-excel.html
/Lars