Q&A: Neutral Density and Circular Polarizer Filters
“What is the difference between using a GND filter and a circular polarizer?”
Hey Kathy! Okay, I hope this ends up making sense!
Simply put, a neutral density filter is like putting sunglasses on your lens. If you take two pictures with the same settings but one without an ND filter and one with an ND filter, the picture with the filter will be darker. A graduated neutral density filter is kind of like the sunglasses that are dark at the top and clear at the bottom. You’d use a filter like that if you wanted your blue sky to be darker but your grass/landscape to be regular exposure.
A polarizer filter is mostly used to reduce glare and reflections from glass, water, and other surfaces. Because of the reduced glare/reflections, colors often appear more saturated. Polarizer filters come in both linear and circular, but only the circular polarizers work with autofocus lenses.
Does that answer your question? :)