This is a plugin for the chimera observatory control system https://github.com/astroufsc/chimera.

It subscribes to filter wheel filterChange() events to apply offsets in the focuser position for different filter thickness and refraction indexes.

Install this plugin and configure names and offsets for each filter in focus_filters and focus_difference config parameters. To move steps INm you should use a negative number, to move OUT, a positive one.

pip install -U https://github.com/astroufsc/chimera-filterchange/archive/master.zip

- type: FilterFocus
  focuser: /Focuser/0
  filterwheel: /FilterWheel/0
  focus_filters: "U B V R I"  # Filter names in order of focus_difference
  focus_difference: "-100 0 0 0 0",  # e.g. from V to U, move -100 (IN), from U to V, move +100 (OUT)

For more information, contact us on chimera's discussion list: https://groups.google.com/forum/#!forum/chimera-discuss

Bug reports and patches are welcome and can be sent over our GitHub page: https://github.com/astroufsc/chimera-filterfocus/