What are the different types of lens filters, and are they useless now with editing software? This guide will walk you through what they are for, and why they are still good. http://xlightphotography.com/types-of-lens-filters/
DIFFERENT SHAPES • Lens filters usually come in 3 shapes – Circular, square and rectangular. • Circular filters are the most common. • Square and rectangular are less common, but they are usually larger in size, making them easier to fit onto different lenses.
1) CLEAR FILTER • As the name implies, this is a filter that is clear. • Does pretty much nothing. • Used to protect the lens from scratches and dust. • Scratch the cheap filter, not destroy the expensive lens.