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Thanks Daniel. It's looking like a pair of 25mm Vixen plossls. Just bought a pair of 15mm vixens from Myastroshop, sharp field stops in these. My 20mm GSOs are a little bit vague on the edges, could be the limit, but I know some eyepiece brands have less than sharp field stops, GSO unfortunately is one of them in some or their plossls.
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