Hi,
I am using 3.0.3.151 on Win 10. If I choose the predefined gain settings (e.g. unity-gain) from the ZWO-ASCOM driver of ASI1600MCC the resulting filenames do not contain the %cg value (“gain_NA”). Well, the information is correctly written into the FITS-header anyway. I found out that, if you set the gain in the event-settings, the variable is exported to the filename. Maybe this is a little bug?
CS,
Chris