Digital Circular Polarizing

How many stops will this polarising filter reduce the light?
It is the Hoya 58mm Pro-1 Digital Circular Polarising Filter.
http://www.amazon.co.uk/Hoya-58mm-Digital-Circular-Filter/dp/B000KL7J3A
Every Polarising filter halves the light passing through it, it doesn't vary as far as exposure goes it's always two f stops.
What does vary is the effect on Polarised Light, Light that is oscillating in only one plane, mainly from a blue sky, as soon as it is diffused or reflected off an object the Light ceases to be Polarised. For everything else it's two f stops.
Polarising filters are alternate black and clear lines, overall half of the area of the filter is black, hence the two f stops, these lines are less than the wavelength of light wide, polarised light oscillating in one plane will be varied, if the lines on the filter line up with the polarised light that part of the image, and only that part of the image, will be brighter, if the direction of polarised light opposes the direction of the lines on the filter the polarised light will be dimmer (by a further two f stops).
Chris
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Circular Polarizer Example 1
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