Bought this Century Optics 77mm wide angle adapter for the Lee filter system after hearing it was the same as the Lee filters. I can confirm it works great with my Lee Foundation Kit and comes in Lee branded packaging. I also wanted to add that at 17mm on a full frame in 35mm format (17-40L on 5D) there is no vignetting at all. Not sure what the other reviewer is talking about, it's a wide angle adapter and it works great.
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