Hello
I calibrated my SCT with camera attached like here: https://starizona.com/tutorial/collimating-a-schmidt-cassegrain/
It would be helpful to have more concentric circles in the cross hair overlay (reticule) to ease the calibration.
E.g. 1. click shows the present reticule, 2. click one with more circles, 3. click anoother one. 4. click hides.
Best regards
Thomas Götz