In black and white photography, different colored filters block different parts of the color spectrum, causing changes in contrast and tonal relations. Depending on which filter you are using and how deep the color is, these changes can be very dramatic. For example, two colors side by side, even contrasting colors like red and gray, might be rendered as identical shades of gray, but if you use a red filter the red will be rendered much lighter while the blue will become an even darker shade of gray. This can be helpful when photographing trace evidence. Filters page 2 Skylight and UV filters offer much more subtle image control.
Film is more sensitive to ultraviolet lights than our eyes are.
A blue haze may appear in photographs taken when there is excessive UV light. This can put a bluish cast on our film and sometimes obscures distant details .A UV filter can reduce atmospheric haze when it is caused by blue radiation and ultraviolet. Since our eyes cannot see this part of the spectrum, UV filters, also known as daylight or haze filters, are recommended for all outdoor photography. A skylight filter is a good investment to keep on your lens at all times. It is a lot cheaper to replace a fifteen dollar filter than a three hundred dollar lens, if a piece of gravel bounces up against your camera Color compensating filters control color rendition by attenuating the red, blue or green part of the color spectrum.