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My understanding is that the Celestron Ultima line was originally based on the Masuyama design.
There is (or was) an offering from Baader which was essentially the same eyepiece
(maybe the Hyperion - I forget exactly).
I used to have a pair of 42mm Ultimas at one point.
The apparent fov was fairly narrow, but my impression was that they were
in a different league (waaaaaay better) than the Meade 40mm SWA that I owned at the same time.
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