Thread: Getting focus with Prime focus?
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  #5  
Old 27-12-2011, 02:31 PM
gbeal
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Join Date: Oct 2004
Location: New Zealand
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In addition to the measurement that Adam suggested, 44mm or so, the T ring at about 10mm needs to be considered, this giving the magical 55-56mm of distance that is used with the MPCC and other flatteners.
Gary
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