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Skywatcher Field Flattener

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I don't get one thing I read here: the SW FF seems to do wonders on the Equinox ED80, however it sucks on the Onyx ED80. I have both scopes (going to sell one and keep the other...haven't decided which) and the

seem to be twin OTAS. Same focal length, same aperture same F/ratio, same FPL53 glass...how can the resilts be so different?


paulo Mesquita

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