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Focusing problem, need some help.
Hi all, need some sound advise. I have a GSO 16 trussed dob that has a problem where I cannot rack the focuser in far enough to focus planets, moon or stars with the higher powered 1.25 ep's (6,9,15 and 20), the 25 and 32 work OK. The 2 inch (25 and 50) work fine. I have tried moving the primary and secondary up and down the tube but no success. All the ep's are GSO plossl. Today I focused on a tree some 500 mt away and all ep,s worked fine even with a barlows. I have collimated the scope with the eye and then a laser collimater to check. Can someone help please.
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