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I am not a big fan of the old "get a barlow and double your eyepiece collection" advice that is often touted. I have only used good quality barlows (a 2x Televue barlow and a 2.5x TV Powermate) but the view using them is never as good as using a good quality high power eyepiece.
I have used a 13mm Nagler, 13mm Ethos and 10mm Ethos with the barlow and the view in the 6mm Delos or the 7mm Nagler (when I had that) was always better. Specifically, the barlowed 13mm Nag versus the 7mm Nag was only a 7.35% greater mag (231x against 214x) but the image was considerably dimmer and there were noticable more odd reflections with bright objects.
As a result I sold the Powermate and while I still have the barlow, it rarely leaves the case.
Malcolm
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