There is a lot of optical junk out there.
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http://www.dpreview.com/forums/thread/3627547?page=1
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Light Cannon looks like a good choice...not.
I somehow doubt that, in these 9 months, those horrible cheap adapters have been redesigned to offer the level of performance of the original speedbooster. Please post side-by-side tests, I'd love to be wrong on this one (usually I'm a very cheap bastard).