Why Optical Filters?
Optical filters function in digital photography much as they do in film work. Properly used, they can condition the light entering the camera in favorable ways—often in ways that post-processing can't easily duplicate.
I find it useful to think of optical filters as a kind of image pre-processing. As with post-processing, optical filters can foster maximum photorealism, maximum visual impact or various things in between. Mounting filter increases your risk of flare, among other downsides by no means unique to digital cameras.
But when you find yourself face to face with a photographic challenge nicely addressed by a particular filter type, the cost/benefit ratio is usually more than favorable. In fact, it's not uncommon for filters to make otherwise difficult or impossible shots feasible.
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