There appears to be some issues with PHD2 and ZWO cameras...
Requested test procedure:
- download and install the test version from
https://openphdguiding.org/phd2-2.6....-installer.exe
- calibrate if necessary
- run the Guiding Assistant and let it measure Declination backlash
- enable PHD2 backlash compensation if the GA offers that suggestion
- guide for a several minutes, long enough to see some declination guiding direction reversals and some backlash correction pulses
- upload your PHD2 guide log and debug log from the session (
https://openphdguiding.org/getting-help/)
The PHD guys say:
We were able to track down the problem and it turns out to be related to PHD2 retrieving stale data from the ZWO camera -- camera frames that started exposing before the backlash guide pulse finished. We got some help from ZWO and have a new build of PHD2 ready for testing. We believe this will fix the backlash compensation overshoot issue and generally improve guiding for ZWO cameras. We would like some help testing it.