I know this might sound stupid, however here we go!!
Bought my son a skyliner 200p classic of eBay, had a few ups and downs since, but with the help on these forums sorted most. However one hing that confuses me, is why the different eyepieces he has end up needing different 2” to 1.25 adapters. It didn’t come with any adapters, just 2 2” Celestron luminous eyepieces, got advised to buy an adapter. So bought one of these https://www.firstlightoptics.com/adapters/astro-essentials-2-to-125-reducer-adapter.html which works with a couple of plossl eyepieces he got for Christmas, but I got him a couple of bst in 8mm and 12mm as an upgrade and I can’t get focus with them. Have tried them in this https://www.firstlightoptics.com/dobsonians/skywatcher-heritage-76-mini-dobsonian.html which he got last year and they get focus fine. I take it I need a different type of adapter? Could anyone point me in the right place please.
thanks for any help given.