Temporary procedure to focus INGRID during the next runs, to compensate for
the INGRID array tilt. It will give a reasonable compromise focus across the chip.
Set the INGRID internal focus to -200 microns: SYS>ifocus ingrid -200
Find the best telescope focus using the normal procedure
(i.e. use command focusrun and step the telescope
focus between approx. 98.5 and 98.9 with steps of 0.05mm).
See the INGRID user guide for details. Use only stars located in the center
of array.
Subtract 140 microns to the INGRID internal focus:
SYS>ifocus ingrid -340