I use ASTAP for over a year for plate solving and I am very content with its performance. Lately I wanted to try ASTAP as the focus metrics provider as well, but it didn’t work so far. I use a STC-Duo narrowband Filter with an ASI2600MC Pro (OSC) camera. Exposure time for plate solving is 4 s, for focusing 20 s.
When ASTAP is used as focus metrics provider, the first AF frame is captured, the frame is diplayed with HFD values, but not data point is added to the AutoFocus plot (HFD vs. focus position). The second frame is captured, same result. Then AutoFocus stops. In the appended logfile, this was tried twice, at 23:04 and at 23:07.
When SGP is used as focus metrics provider, the AF process works as expected with otherwise the same AF settings.
Link to Logs
OS: Windows 10 Pro, Version 20H2, Build 19042.867
Ver: 18.104.22.1681 beta (64 bit)