Alignment of wide field corrector against the primary mirror optical axis by spot images on auto guide cameras for prime focus spectrograph of Subaru Telescope

Alignment between the primary mirror of the telescope and wide field corrector (WFC) is necessary for Prime Focus Spectrograph (PFS) ,which is the next instrument for Subaru telescope in Hawaii. From 6 defocused star images we can align the optical axis of wide field corrector to primary mirror's optical axis with required accuracy.