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I just checked my emails and the Mogg one is apparently 0.66.
The 0.8 isn't much of a reduction but it does flatten the field beautifully, almost out the the extremes of the corners. I bought mine directly from WO in the States but I believe Andrewscom sells them for $249 (P-Flat1 is the item number on the site). Even though it only drops the f7.5 down to f/6 I love using it simply because of the great job it does in removing those mis-shappened stars at the corner. It's not perfect but for the price it's damn good.
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