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Paul, it is no Teleview however, it is a modern multi element design, very good anti reflection coatings, nice and solid. The refractor images are superb with almost no coma in the edge. In my 12" f5 dob it gets a little soft toward the 1/3 outer edge as to be expected, a coma corrector would do wonders with an f4-5 scope.
Over all it is one of my favorite eye pieces for large field DSO work. It is a large bit of gear. One of the best astro dollars spent by me.
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