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For a different perspective I find my 2" GSO Barlow useless (it's not the ED type and not the one in your link). I don't know if it is just me, or Barlows in general as I haven't tried any others, but even with good seeing I have never felt that I can see any more detail with the Barlow than without it (using the same eyepiece). Sure the target is bigger, but it is also more blurred.
I'm considering the cheaper Televue one (not the powermate), but I won't be buying any until I've tried some out....
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