Hi Stuart. FWIW, I have a GSO 12 Dob and have read that the Meade systems use the same mirrors. From star testing against the diagrams in Suiter's book, this particular mirror seems to be corrected to about 1/14 wave (surface), there is a slight turned edge and a little roughness (neither of which is particularly noticeable when viewing). Overall, it is good to look through, snaps into focus and runs out of steam on Saturn and the moon at about 500x if seeing allows. Hope this is useful. Regards Ray
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