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Hi James,
I've just done a fair bit of research on this for my GSO RC8. I want a shorter FL and faster FR so I can fit a bit more in my images, not to mention shorter exposures for narrow band.
The only reducer/flattener I could find that works well with RCs was the televue TRF2008. I'm yet to get one due to its price ($400) and the fact that I got a moonlite focuser for the scope (also a must it you want good images).
Hope this helps.
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