I understand the benefit of the filter when near water or other highly reflective surfaces, but what about other situations? I am going to be taking pictures of a family at a local park that has a tree canopy that provides shade with splotches of sunlight. This park is also on the water with a dock. About half of our time will be in the shade and the other half will be on the water. I have used this location before with out a polarizer with good results, but Im curious what could I expect if I used a filter? I dont currently own one so I dont have any experience with one. Any exaples of with and with out would be greatly appreciated. Thanks to all.