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I have the same scope and notice no aberrations but I do use it with a 294mc Colour camera so it's not a full frame like yours
and the L-Ultimate. I haven't noticed any aberrrations and the field is extremely flat right up to the corners.
I think the trail off could be a filter/fullframe issue and maybe some tilt in the image train?
Blue is always the most notorious channel for star bloat as it is.
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