There are various types of filter systems and filters to use in photography. The type of camera you own and the lenses you use may dictate the type of filter and the system you need to use. You need to know what lens the filter is for and also what size filters your lenses use. Once you know the system of filters you are going to use you can then choose the filters you need. These filter systems include: screw on, bayonet, series, drop-in, square and rectangular systems and matte boxes.
Filters are made of various types of materials such as plastic, resin, glass or soft polyester gelatin. Some filters are nothing more than lens protectors while others make the image more accurate or give your photos special effects or colors. When using filters you generally have to know what type of photographic effects you are aiming to get. Filters can range in price from about $10 to $800.