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Great discs Mark.The Quark works well with smaller apertures but once you go up to say 127mm or 150mm the seeing really becomes the deciding factor.Back when the Sun was more active I think at my location the use of 150mm of aperture was only feasible on a couple of occasions.I have a Quark on a 150mm scope with an internal etalon but found myself stopping down to 100mm for a better result.
Cheers Derek
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