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I used TV Barlows for many years, and recently changed over to the Powermates. One of the best decisions I've made so far!!
The Powermate gives a much better image.
Also, the variable magnification you get when you change the back focus distance on a conventional Barlow is almost non-existant.
So for imaging, I'd certainly prefer to use a Powermate.
For the average visual observing an ED Barlow would do the job pretty well.
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