Sounds interesting and a helluva lot cheaper than the Canon or Sigma ring-lights, but...
Quote:
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This versatile macro flash can mount to almost any digital or film SLR lens made via the supplied 49mm, 52mm and 55mm adapter rings or other optionally available rings. Optimized to prevent vignetting with most lenses having a filter size of 58mm or smaller, these optional adapter rings are available in sizes from 43mm through 77mm.
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So I take that to mean it isn't big enough for most lenses.