Section view of the Kryoneri Prime Focus Instrument (KPFI) optical layout. The position of the field corrector lenses #1, #2, and #3, the dichroic beam splitter, as well as the lens pair elements in front of the Lunar imaging detectors and the R- and I-band filters are shown. The focus plate and the instrument selector stage are also indicated (Credit: DFM Engineering Inc.).
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