I just bought a 'Emolux 12mm Pro AF Digital MC High Defination Wide Angle Lens for DSLR' 52mm at Alan Photo. The box describes it as 12mm Wcon for 18mm lens.

I just want to ask a very very newbie question:- since I am using a Lumix FZ8, fitting this 12mm lens means what is the conversion rate? Is it a 0.66x wide converter (since 12mm is 0.66x of 18mm)?

But the salesman Anthony told me that it is a 0.5x Wcon.... i am confused!!!!