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Get a F3.3 reducer. With the 1/3" chip size of the starshoot you can afford to trade off image circle size for greater focal reduction. It will also give you a better pixel ratio per arcsecond because the starshoot has fairly small pixel size of 6.5 x 6.25 µm. With the F6.3 reducer you will still be imaging at 1 arcsecond per pixel on your LX90 8". With the F3.3 reducer you will have it at a far more manageable 2 arc seconds per pixel.
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