If you ask most consumer-camera owners why they keep a filter on their lens, a majority will most likely reply, “For protection.” Although filters do, in fact, protect the surface of your lens against dust, moisture and the occasional thumb print, the primary function of lens filters is really to improve the image quality of the pictures you take—depending on the filter you’re using and how you use it—in a variety of obvious and not-so-obvious ways.
Are there a few basic filters or do I need to buy many filters?
The most basic filters are ultra-violet reducing filters (UV), Skylight filters and protection filters, which depending on the manufacturer are either glass filters with basic anti-reflective coatings, or in some cases, merely plainclothes UV filters, which isn’t dishonest. To keep the front element of your lens clean and safe, any of the above will suffice, but if you’re looking to protect your lens and improve the image quality of your stills and video, you’re going to want to purchase a UV or Skylight filter. [more]