  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.....
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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.
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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. |
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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. |
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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. |
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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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