Adding Filters to Your Digital Camera’s Lens
Filters, glass disks that you can screw onto your digital camera’s lens, can change the look and feel of your digital photos. You can use filters to get unique image results:
Warm up your photos.
Some filters produce what photographers refer to as a warming effect. This filter can help make up for the lack of color in midday light and tries to add some reddish-orange color to the scene.
Cool your photos down.
Cooling filters add blue to the scene to reduce the reddish-orange color.
Blur your subject or background, as shown in this figure.
These neutral density (ND) filters (neutral because they have no color, and density because they block light) reduce the amount of light available.
Remove fast-moving scene elements.
By stacking neutral density filters, you can create such a long exposure that no fast-moving elements (such as cars, as in this figure) are in the scene long enough to register in the image.
Compensate for a scene in which one half is much brighter than the other, like in this figure.
A split neutral density filter provides half neutral density and half clear filtration.
Reduce the glare bouncing off shiny surfaces.
Polarizing filters can reduce this glare. Simply attach the filter and view the image through your LCD. Rotate the polarizer until the glare disappears.