Focus offset measurement automation with Dragscript

I’m starting to get an array system up and running and want to measure my filter offsets. What better way than to use Dragscript to automate it! I’ve cycled through my 7 filters 3x with a RoboStar focus on each filter, followed by a 10s image.

Screen Shot 2021-08-25 at 3.09.25 PM

Since the focus position is stored in the FITs header, I use my planner/inspector app to check the consistency of the positions and their offset. You can see some pattern in the focus position where there’s a slight shift to lower focus positions. This is presumably due to the scope continuing to cool through the experiment.

I can also export these data in the inspector into a csv file and compute the offsets from there (I use pandas, but excel works just as well).
Screen Shot 2021-08-25 at 3.06.21 PM

3 Likes

I add this one directly with dragscript

Thank Gabe