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Sounds like there's a blemish in the multicoated surface of the barlow lens.
I bought a 3x ED barlow from Andrews with same problem - sent it back for another with no problem. send it back DJV, it'll bug you if you don't!!
I too bought a Toucam through ebay, and I suppose sending it back to say Hong Kong or the Phillipines is a hassle but it'll bug you too!!!!
I use the Toucam for guiding only so an edge abberation wouldn't be so much of a drama.
All the best
Doug
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