I am wanting to invest in a polarising filter for my camera (a Canon T2i/550D). What sort of things should I be looking for? What differentiates a good polariser from a bad one? Are there any brands ...
When I bought my polarizer, a friend told me that I should get a circular one, because the linear ones can mess with the autofocus. Is this true? What should each be used for?
I received a circular polarizing filter as a gift, but I have a hard time determining when I should be using it. I've done river shots with some success, but other than that, it doesn't seem to do ...