== P2.8	Looking for filter defects/artifacts + Science detector calibrations repeat == 
•	**Phase**		:	2  
•	**Status**		: 	Draft	 
•	**Category**		: 	Daytime testing (functionality and operability) (C2)
•	**Recurrence**	: 	once at commissioning
•	**Duration**		: 	2 days
**Description**
•	Finding the filter defects/artifacts using an internal calibration source (flat /on-axis PSF?) within the instrument.

**Prerequisites**
•	NCPA measurement (within SHARK-NIR bench using internal sources) available.

**Procedure**
•	Take the images of all the filters using internal calibration source lamps within the instrument to locate/find out the filter effects/artifacts.
•	You may take short- and long-exposures to get better contrast of the features if required.
•	Repeat the science calibrations as done in [wiki:/docs/CommissioningPlan/P1.9 P1.9].
* Perform the working of this monitoring activity [wiki:/docs/Commissioning/SNM1 Filter wheels reproducibility monitoring.]

**Success criteria**
•	All the filter images saved.
**Notes**
•	The time dedicated to this activity has to be considered in combination with the next activity if needed. Parallelism is possible.
**LBTO support**

**Associated SHARK-NIR personnel**

**Date performed and by whom**

**Comments**

MB: I wonder why this needs to happen in this phase. I would say it could be done at any moment with internal sources, except of course for the dichroic / LBT mirrors