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In the LVW series the 3.5 ... 22 have dual barrels - 2" and 1.25". No adapters required if you want to use them all as 2" eyepieces. The 42 has a fairly long barrel too to accomodate the backfocus.
As I said, the designer gave these more thought than most and I can't help suspecting he must have been a stargazer with firsthand experience of what grates in practise.
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