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I have a GSO 20mm, not a bad eyepiece but for a fast 'scope it does struggle with the edge of field definition. I used to use mine with an OIII filter when I used my 300mm Dob and 120mm refractor and my 27mm Panoptic was used as a general low power eyepiece (filterless). Alas, I have sold all my Televue eyepieces and can only take so much with me back to China.
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