There are filters for protection as well as for effects. You can get the idea from the mobile camera app that has so many of them, the same goes for traditional camera filters for DSLR. There is an essential accessory for photography as it can be used to protect your device lens as well offering a lot of effects. UV light filters help a photographer to protect his camera lens from harmful UV lights while shooting in sunlight particularly in skylight photography. There is a dedicated Skylight Filter for skylight photography. The second type of is Polarized Filters and they are very good for those people who love to shoot pictures outside. They are like sunglasses with colorful shades. Neutral Density filters are next and last in the category. It reduces the amount of light that falls on the camera sensor. It is useful in capturing images with low shutter speed.