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Hi - I think the sweet spot in terms of optimum refrcator size for imaging is determined primarily by your mount quality and guiding accuracy. For me with an LXD75 and all sorts of guiding woes I'm pushing it with at ED80. It would be pointless for me to have a five inch flurorite if all I can get is wobbly stars. If you got a perfectly polar aligned G11 the sweet spot is probably as big as you can afford. Regs, Rob
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