I am planning to buy Circular Polarising filter to take some good photos of landscapes with perfect blue skies and waters …
But I want to understand more on the types of filters and their advantages … I have 3 different lenses with different diameters … so should I go with Square filters or circular ?
A circular polarizing filter will help bring more color to the sky and water. Neutral density filters help reduce light. Graduated filters come in different combinations and are the best for difficult lighting situations.
I think you are confusing the lens diameter with it’s focal length range. The lens diameter doesn’t change between lenses for the same camera. As far as the polarizing filter goes, it’s a must have if you want to take clear shoots of highly reflective surfaces.