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No M90 was F6.9. The first versions were badged incorrectly. S&T discovered this back in '07 when the reviewed the first series. There is a heap of threads on this on CN forums if you want to research it further.
I recently bought an M90 from Astro Optical and at the time their prices were considerably better than Andrews so keep them in mind also.
Greg, the 102ed from Stellarvue uses FPL-51 glass so it shouldn't be as well corrected as the Megrez.
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