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.
Yoko Tanaka, Yuki Moritani, Naruhisa Takato, and Naoyuki Tamura, "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," Proc. SPIE 10704, Observatory Operations: Strategies, Processes, and Systems VII, 1070405 (Presented at SPIE Astronomical Telescopes + Instrumentation: June 11, 2018; Published: 10 July 2018); https://doi.org/10.1117/12.2310030.
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