I saw this new series of filter in Japan:
Kenko and Hoya are under the same parent company. I heard that the Kenko Pro1 filters are almost identical to the Hoya Pro1.
This new series of Zeta filters is clearly marketed as higher end filter then the Pro1s. They are thinner and has better transmission characteristics and causes less vignetting. Anyone know if there is a Hoya equivalent or if there is any review comparing these zeta series with other brands?