== P3.2	Telescope control – checking focus for different wavelengths == 
•	**Phase**		:	3  
•	**Status**		: 	Draft	 
•	**Category**		: 	Nighttime testing (functionality and operability) (C4)
•	**Recurrence**	: 	once at commissioning
•	**Duration**		: 	30 minutes
**Description**
•	Focus the telescope and check for chromatic variations (using different filters).
**Prerequisites**
•	Atmospheric conditions: should be able to see bight stars on the sky (preferably close to zenith?).
•	Authorize SHARK-NIR on the SX side.
•	Chose a star/field (or set of stars) which have emissions in all the required wavelengths to be checked.
**Procedure**
•	Send the preset of the selected target.
•	Focus the star for a given filter. If needed reduce the aberrations by changing/moving M2.
•	Check if the same focus is good for other filters as well.
**Success criteria**
•	No unexpected chromatic focus behaviour.
**Notes**
**LBTO support**
**Associated SHARK-NIR personnel**
•	JF, LM, MdP, MM (from AZ)
**Date performed and by whom**