Left: extract of IRSF Ks band image of MOA-2007-BLG-192  used to calibrate the NACO photometry of the 18″ × 18″ large intersection fov of the coadded NACO frames in Ks band (right). MOA-2007-BLG-192 is marked with the half cross hair. The stars annotated with “1” and “2” serve as PSF-reference and photometric zeropoint calibrators. Furthermore these two stars are common to all bands and epochs. The bright stars north of the two references are either too crowded, in the non-linear regime or too far away from the target.