UV filter vs Polarizer filter

Started May 20, 2008 | Discussions thread
austin design
New MemberPosts: 3
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Re: Well...
In reply to tjack, Jan 4, 2013

tjack wrote:

Jim Boutilier wrote:

While digital cameras are less sensitive to UV than film they are not
immune to the effects so where you are taking pictures of distant
landscapes, particularly at high altitudes, a UV filter han help
eliminate the "haze" or fog caused by the UV light.

Clarification... This is NOT the "haze" they cut down on. In the old days of film, UV light would cause a haze on the film itself. Or, UV light would bounce off particles in the air and get recorded by the film. This had absolutely nothing to do with the actual haze in the scene. Also, the film recorded too much blue at high altitudes so a Skylight 1A or 1B was used to cut UV and some blue.

These days, film and digital sensors assemblies are not sensitive to UV light and do not create the haze as in the old days. If there is haze in the scene, there will be haze in the image. No filter can remove that. The only thing a UV filter does is to "protect" the front element of the lens in bad conditions. There is no effect on the image itself.

Plainly not so, according to Bjorn Petersen.  Of water (vs. pollution) based haze's effects on DIGITAL cameras, he writes:

"UV affects image quality in several ways. When photographing outdoors UV light manifests itself in the form of haze, which can vary based on how close you are to large bodies of water or snow (water and snow both reflect sunlight, which in turn magnifies UV levels), altitude (the higher you go, the more UV light you encounter), and larger cities (reflective glass and metal-clad structures can also amplify ambient UV levels). This haze robs image detail, especially at longer distances with longer focal length lenses where cumulative haze densities can severely soften the sharp details of distant objects. In many respects, this neutralizes the argument against using filters for fear of compromising the resolving power of the lens, most notably telephoto lenses."

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