- A UV filter removes ultraviolet light from a photograph. In most images, however, this has little to no effect; you may reduce outdoor haze by a small percentage. The real advantage of the UV filter is glass protection. By having a cheaply priced filter on your lens, you immensely reduce the risk that the glass may be scratched or damaged. If a rogue tree branch or accidental drop damages a $10 filter instead of a $400 lens, it was worth the purchase.
- The favorite among photographers, a circular polarizing filter will deepen the colors and enhance the contrast of your photos. This is especially useful for images that include the sky. In addition, it will allow you to see through some transparent objects by removing the glare caused by the sun. This includes surfaces like water and glass. Be sure your polarizing filter is "circular." Linear filters will not work with digital cameras, like the Rebel XTi.
- The ND, or neutral-density, filter will reduce the amount of light that enters your camera. Most commonly used in video work, an ND filter is best utilized on a bright day. Attaching one to your lens will reduce the light by 1/3, 1/2 or even further, depending on its rating. Variable-ND filters also exist and are the most versatile. Without this filter, you would need to change the camera's settings to reduce the exposure to light, which may result in an undesirable artistic style.
- Finally, there are the standard color filters. These come in a variety of shades and can artistically alter your photograph. For example, if you are taking a posed portrait and desire a cold emotional appearance, attaching a blue filter will take away warmth from the photo and feel very "cool." This effect can be replicated in other styles by using other colors.
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