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Thank you both....
Steve - sounds like your lens is out of collimation - at least thats what my lx90 results were like until i fixed it....for the life of me i dont know how you would collimate a dslr lens though...
Vignetting would be less of an issue for me - i'd use a dedicated astro cam with a smaller sensor for that. (there is no way a seestar could hold the weight of an SLR)
Ive seen a view posts on cloudynights and dpreview - so its hard to sort which lens is worth the bother...
thanks again!
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