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If you wear eyeglasses, get the Barlow, else I prefer eyepieces. But the problem with a standard 4mm Plossl is the very narrow eyerelief. I got one from Andrews and couldn't get my eye close enough to see the whole image. Eventually, I did - after I removed the rubber eyecup from the eyepiece. Then it became a good eyepiece, and I was happy with it.
Seben have lots of good inexpensive stuff. The 17mm Superwide Angle eyepiece I got for $34 was pretty good, not quite as good as my old Meade 18mm Superwide, but a fraction of what I originally paid for the Meade. Also, Seben's Flat Field eyepieces seem to be the same as everybody else's who sell them, but they are cheaper from Seben.
If you eventually want to hunt faint stuff like galaxies, it's best to get a nice wide angle or ultra wideangle eyepiece that gives a 2mm exit pupil. If your telescope is f/6, then that equates to a 12mm eyepiece.
Regards,
Renato
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