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Don't buy the 15mm. Unless it has changed in the last year, it is without doubt the worst eyepiece I've ever owned. (I ended up putting it up for auction on this website as a joke fundraiser for IIS. Raised $15, which was $15 over priced.)
The 30mm is a different kettle of fish. Better build quality, nice finder EP for the dob, and quite reasonable on axis. Not the Nagler, of course, but a very servicable eyepiece nonetheless, and worth the price of admission (used to be about $150).
But forget about the 15. It was a dog.
Cheers,
Brian.
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