Quote Originally Posted by Sean Setters
There are CPLs that are designed to block less light (the new Hoya HD CPL is said to block about a stop less than others),

Minor correction - according to their press release, the new Hoya HRT CPL offers ~1/3 stop more light. I think 'HRT' is the improved polarizing film, and 'HD' is their new high-density (harder) glass.


Quote Originally Posted by mpphoto12
But how will i know how to rotate the front? im still a little troubled about the point of it rotating.

As others stated, you simply rotate the filter until you achieve the effect you want, as seen through the viewfinder.