Anthony Pearson
Senior Member
This might be of use for those of you fishing clear rivers and wanting to film/photograph fish:
As you can see from the images, this works really well
Circular Universal Portable Polarizer Camera Lens CPL Filter Professional | eBay
Since the natural light vibrates evenly in all directions, and the polarizer leaves the light passing through only a certain vibration direction. it can effectively reduce the reflection of water, glass, etc.
www.ebay.co.uk
As you can see from the images, this works really well