DSLR Camera Lens Filters
One way to get special effects and change lighting attributes is to use a lens filter — although many digital cameras except for the higher-end models do not accept the traditional screw-on filters some systems such as one by Cokin, a leader in the filter field can be used on many models via an adapter that mounts to the tripod base attachment and has holders for gels that work similar to lens filters.
When filters are not available often some of the effects they can generate can be duplicated afterwards using digital software, but correcting and shaping the image up front is often best, especially in the fields of field service photography where there can be no question that an image was ‘doctored’ after being taken.
Typically a filter screws into the recessed threaded ring in the front of your camera’s lens. This is called the ‘screw mount’ and the size of the mount varies with each camera but normally ranges from 49mm to 55mm, and requires a corresponding size filter or lens cover.
A secret many professionals use to protect expensive lenses which can be damaged if splashed by water or touched by hands is to use a neutral filter on their lenses all the time to allow them to clean it with normal tissue paper and not worry about oils or other substances ruining the lens. This type of lens is normally called a “Neutral” filter, although you can also use “UV” or “Skylight” lens filters for this purpose as well. All filters are normally threaded to additional lenses can be placed onto it without removing it.
