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yep they are right,
Sky watcher in their infinite wisdom decided to make a not 2", 2" focuser... don't ask me why.
It will not affect the "performance" in any way apart from push back the focus point by how ever much the silver ring is showing.
I have done the modification before for machining the collar down until it just fits a 2" ep though. Though i would just get a 10:1 focuser either moonlight or FT, and be done with it that way its accurate, and easy to focus at high mag.
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