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I believe that the new Celestron design has a two element field flattener built in as well for a truly flat field.
Neverthless, I can't see a lot of attraction in shooting at F10. I would have thought that at least the field flattener could have been designed as a telecompressor as well giving an F7 to F8 focus which would have at least challenged the GSO's in the marketplace.
Perhaps there will be an add on lens set which will take it down to f7? Maybe the stock F6.3 telecompressors will work a lot better tacked on to a flat field instrument.
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