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My ED80 is racked in quite a bit with my eyepieces & diagonal (50mm GSO).
I am using TV Plossls: 32, 20, 15 & 12 which are all parafocal (at same focus) so refocusing is minimal but they all focus OK. In fact I need the diagonal to reach focus...which is normal.
Just check your 2 inch focus draw tube ring & adaptor is screwed inwards as much as possible, see pic.
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