== P2.6	Measurement of NCPA == 
•	**Phase**		:	2  
•	**Status**		: 	Draft	 
•	**Category**		: 	Daytime calibration (C3)
•	**Recurrence**	: 	after instrument installation at telescope platform
•	**Duration**		: 	3 hour(s)
**Description**
•	Measure the Non-Common Path Aberrations (NCPA).
**Prerequisites**
•	RR mounted and SHARK-NIR aligned to telescope.
**Procedure**
•	In closed-loop, we optimize the PSF shape on SCICAM using the trial & error algorithm used by LBTO team during LUCI calibrations changing M2 reference shape applying modes coefficients.
•	We also perform the phase-diversity tests using the same light source and look at the NCPA output produced.
•	Depending on the two results and the quality of PSF, we may choose one or the other or the combination of both.
•	Note that we may do this for different elevation angles.
**Success criteria**
•	NCPA estimated and applied on the ASM? (how often we do this? Every night?
•	Satisfactory PSF quality with closed-loop and get a new and improved daytime telescope model for SHARK-NIR?
**Notes**
•	See activity 8.1 in AD4 for more details. 
**LBTO support**
•	Mount the RR on SX
•	Support from LBTI?
**Associated SHARK-NIR personnel**
•	JF, LM, MdP, MM (from AZ)
**Date performed and by whom**