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Thanks Kevin. The 80 is 600mm (f7.5) The 100 is 900mm (f9) ; Ok ,now I get it. Think of the scopes as zoom lenses for my camera, longer the zoom harder to track and stop stars from ob-longing as it were. Yes, ed80 is looking good. I can get the ed80 heq5 combo from Aus. Hundreds cheaper than here in NZ. So looking forward to it. Thanks again guys.
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