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So am I, Geoff! I am yet to try them out under dark skies. 19mm Panoptic showed no vignetting, so 25mm plossls should be okay too. But that would probably be the widest you could go. And you still need a barlow or integrated magnifying corrector to reach focus in a Newt. So about 0.6 degree will be the widest true field in my Dob.
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