I'm going for overseas trip and to prep for it, i'm looking at Polarising and ND Filters
But my only knowledge of them simply is that:-
polar filters will 'erase' unwanted reflections or glares off glass and off surface of water.
neutral density acts like sunglasses, blocking out light coming into the lens, allowing for longer shutters.
But as i read on other photography webby they seems to do more stuffs than that???
Need some pointers on these two filters...