focusrun generates a frame on each of the WFC CCDs in which multiple exposures have been made; the telescope is stepped in focus and position between each exposure.
A GUI is displayed:
The frames are saved as archived runs.
Before using focusrun, the telescope must be tracking and the guide loop must be open.
Now start the GUI:
focusrun &
Set the parameters of the focusrun in the entry fields and start the run with the left-hand button. When the run finishes, you can repeat it with new parameters if necessary. Changing the entry fields during a run does not affect the behaviour of the current run.
Due to an error in the focus control of the TCS, a focus move of ~0.01mm or less will never complete, causing focusrun to hang; it will time out after three minutes. This problem can also affect you if the first demanded focus happens to be where the focus is currently sitting.