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Hi Paul, just as an update and side note, found a great workaround to curvature in the 30mm ES. May sound funny but unscrewed the Barlow lens from GSO 2" 2x Barlow and inserted barrel component only between the eyepiece and the diagnonal (in my case just messing around as slide in Barlow / reducer effect is based on distance) but as a side affect when in straight through mode without either, and using this extension with the 30mm, it greatly improves the edge of field / removed any noticeable curvature in my 9.25! Lengthens focal length and does therefore decrease fov by about 5-10%, but to have better overall feel to it seems worth it. Anyway, random as it is hope it helps someone else.
Thanks
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