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I have 5x powermate and am very happy with it-visual as well as for photography. Its nice to use a widefield occular on the moon and still have the magnification of a say 9mm - a bit like orbiting moon. Compared to the one-element celestron 2x barlow that came in a kit I must say that it is comparing a kit lens with an L-lens. And the powermates have an option to mount a T-ring on top (in place of the eyepiece holder) which makes them easier to use with an slr cam as the connection is tighter and the lever is reduced.
I am not affiliated to any shops or makers but whenever I read a review where televue was compared to other brands it was the televue that won. You get what you pay for.
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