Sigma Filters


Sigma?s EX DG filters benefit from our multi-layer lens coating, developed to counteract the highly reflective characteristic of image sensors. With older style filters, light would reflect off the image sensor.....
 
Sigma Standard Filters
  Protection Filters - Ultraviolet Filters Your camera won't allow you to develop clear, crisp photos if your camera lens is damaged or dirty. You can protect your thousand dollar lens with a $20 filter if you use a UV or haze filter. These thin glass filters are designed to screw onto the end of your camera lens and you can just leave them on to protect your lens. UV filters can help protect your lenses from dust, moisture and scratches. If your lens is damaged it could cost you quite a bit to repair or replace it. The filters can also give you added benefits of correction for Ultraviolet light which can show on your film as a bluish cast and can sometimes distort distant details. UV filters let you correct for the UV effect to varying degrees. They are also useful if you are shooting mountain and marine scenes, as the haze could affect the color and clarity of the photos. UV filters can be bought for about $20.

Haze Filters Haze Filters do just what they sound like, they filter out haze which is created by minute particles of vapor and dust. Haze settles in the atmosphere and can affect distant photographic scenes. Haze forms when sunlight is scattered by minute particles of matter that exist in the air. Atmospheric conditions have an effect on the amount of haze in the air. Mist, fog, smog, smoke and clouds are all different than haze. Green and red light are scattered by haze, but not as much as ultraviolet radiation, violet and blue light. If you use filters to absorb scattered sunlight you can penetrate the haze. Any filter that can absorb scattered sunlight can be considered a haze filter.

Ultraviolet (UV) Multi-Coated Glass Filter. Multicoated to minimize reflection at the filter surfaces which reduces flare and ghosting. Excellent choice for compatibility with today's digital cameras and lenses Sigma filters provide additional benefits of correction for Ultraviolet(UV) light which can register on film and videotape as a bluish cast and can obscure distant details If desired they can be left on the lens at all times for protection Ultraviolet filters allow you to correct for the UV effect to varying degrees Filter.
  Polarizing Filters These filters are used to reduce or eliminate reflections. They are ideal for photographing through glass or water as the glare from water tends to be white. Polarizing filters can also reduce the effects of haze and darken the blue sky image in black and white and color photography. There are various polarizing filters available to increase color saturation in a photo without altering the hues of image colors, but there are only two principal styles. One style fits over your camera lens, while the other is made to be used over the source of light. They don't affect color, that's why polarizing filters and screens are used in both black and white and color photography. There are two pieces to a polarizer. The front part rotates so you can change the angle of polarization. If you look at the blue sky through a polarizer and rotate it, the sky appears to get darker and then lighter. These filters range in price from about $15 to $800. They come in various sizes.
Sigma DG (Digital) Circular Polarizing Glass Filter. This filter eliminates ultraviolet rays to remove haze from outdoor shots as well as polarizing the light to remove reflections, and increase color saturation, without affecting the overall color balance.
Sigma EX DG Circular Polarizing Glass Filter. Note! Circular polarizers are specifically designed for use with auto-focus SLR cameras (They will also work on manual systems and video cameras without problems). This filter eliminates ultraviolet rays to remove haze from outdoor shots as well as polarizing the light to remove reflections, and increase color saturation, without affecting the overall color balance.
   

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