I have a Seben 8-24mm and while it has a rather scary rattle going on the quality seems very reasonable. I consider it very good value considering its versatility and the measly $60 I paid.
Not having to constantly change eyepieces with each object if I just want a slightly more magnified view is a pleasant time saver. It's not parfocal but not far out either.
Cheers,
Cam
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