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And by the sounds of it, it doesn't matter where in the optical path the focal reducer lives
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It does matter where the focal reducer is and how it is set up. The F6.3 FR is a lot more forgiving than the F3.3 but positioning is still important.
Does the LX200R come with a microfocusser? I have read that you can fit the F6.3 FR in front of the microfocusser and use your normal optical train, but you may have to experiment a bit - note that the distance between the FR and the plane of the imaging chip determines the focal reduction.
With my F3.3 reducer I mount it microfocusser<<FR<<T-adapter<<DSI (if I want to use my microfocusser!)
The biggest surprise I had with my F3.3 reducer is how much experimentation I've had to do with regard to positioning and setup. Consider the instruction sheet that comes with the FR as a guide only and be prepared to experiment!