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Turpol Diaphragms

    Position Diameter Comment
    1 10" double
    2 7.5" double
    3 open
    4 37.5" single
    5 22.5" single
    6 15.0" single
    7 12.5" single
    0 5.25" double, photometry only


    Double diaphragms are available for polarimetry and sky chopping photometry. Distance between hole centers is 15". NB! Note that for polarimetry only diaphragms #1 and #2 should be used.