Dependence of PSF on position in the field of view. This tile is chosen because it has many stars which are located in different CCD position. The red, yellow and blue stars are chosen to check how PSF will change based on the CCD position. In all of them extra object and internal reflection are masked and showed with same color in the middle. Black circles depict to 2, 4 and 6 arcminutes radius. The yellow star is considered as reference star and the other ones normalize to it and the difference of surface brightness at different radii are shown at the bottom panel. Difference at shorter radius than 5 arcmin is less than 0.5 mag/arcsec².