UV Filters: A UV filter is used to reduce UV rays from entering the lens and striking the film. CPL Filters: A polarizer is different than most filters in that it is composed of two pieces of glass, mounted independently inside a round frame so that one can be rotated relative to the other. FLD Filters: A FLD filter (fluorescent light correction) provides the perfect solution for obtaining pleasing skin tones and correct color while shooting without a flash under fluorescent lighting. Lens Hood: With screw mount can be attached to the 52mm lens or filter thread. This can lower the contrast of the image, and enables you to shoot towards the light source, and being reflected inside the lens, without excessive flare. Package includes: 1x 52mm UV filter 1x 52mm CPL filter 1x 52mm FLD filter 1x Lens Hood 1x 3-slot Filter Case