science

What is a Low-Pass Filter and How Does it Work?

Most digital cameras from the 2000s and 2010s are equipped with an optical element called an optical low-pass filter (OLPF), also known as an anti-aliasing (AA) or blur filter. As the name "filter" suggests, this optical element filters out some information coming from the imaged scene.

Why Lens Coatings Are So Important in Photography

In recent years, some lens designers have updated their lenses with new lens coatings. For instance, Pentax's newest limited lenses feature an existing optical design with only a few improvements, including a better lens coating.