Hi Ben,
Good and Cheap are two diametrically opposed descriptions of astro optics.
You get what you pay for.
The Televue Barlows are good value and perform very well as do the Nagler Powermates. Check out the planetary images on my website, most were captured with either a Televue 3 x Barlow or Nagler 5 x Powermate. However, I would never recommend the 5 x Powermate for use with visual observing you would be extremely disappointed with it for that application. For use with visual observing the Televue Barlows are quality products that will not disappoint.
Regards
Trevor
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