Here's a good resource page for those interested in the FSQ series. Ronchi and Spot Diagrams included for the FSQ enthusiasts
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FSQ SERIES 1999/6: The new product FSQ-106 tube announcement (106-530). Modified Petzval desing, 4 lenses / 2 fluorite. 2000/6: New product FSQ-106N (Kai) tube announcement (106-530), lens shade becomes sliding system. 2007/1/30: New product FSQ-106ED tube announcement (106-530). Modified Petzval desing, 4 lenses / 2 ED. 2008/4/18: New product FSQ-85ED tube announcement (85-450). Modified Petzval desing, 4 lenses / 2 ED.
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http://www.astrosurf.com/ilizaso/Tak...-106ED/FSQ.htm