Get a UV filter for your digital camera!
Filed Under (Camera) by mandyywl on 07-09-2009
Tagged Under : digital camera
What is UV filter?
UV filters are individual compounds or mixtures to prevent ultraviolet (UV) light from coming through.
Why we use it?
The “traditional” visible spectrum runs from red to violet. Red light has the longest wavelength and violet the shortest. Light which has a longer wavelength than red is called infrared, and light which has a shorter wavelength than violet is called ultra violet or UV. The wavelength of light is measured in units of nanometers (abbreviated as nm), and 1nm is a billionth of a meter (that’s a US billion or 1000 million, not a UK billion which is a million million!). Light shorter in wavelength than about 400nm is called ultra violet, light longer in wavelength than 700nm is called infrared. UV filters are used in sunscreens to protect skin or in photography to reduce haziness or fogginess created by ultraviolet light.
What are the advantages?
1. The UV filter absorbs ultraviolet rays without changing the exposure.
2. UV filters are among the least expensive filters.
What are the disadvantages?
1. It may not be effective.
2. UV filters (in particular filters lacking coating) may introduce flaring and have negative impact on contrast and sharpness, especially when a strong light source is presented.
