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| B + W 77mm UV (Ultra Violet) Haze Protection Filter for Canon EOS , 20D , SLR Camera |
| Category: Hardware |
Date: 05-09-2005 |
The UV filter is one of the most important filters to own and it should be available for every lens. It has two important purposes. The filter blocks the invisible UV rays which can cause a loss of sharpness. The use of the filter is particularly recommended for work in the mountains, at the ocean, and in areas with very clear air. The contrasts are heightened, and distorting fog is avoided. The colors come out more clearly, and telephoto pictures have more clarity and sharpness. The filter glass is colorless, and hence no increase in the exposure time is required. This type of filter is also eminently suitable as protection for the front lens, and because of its color-neutral properties it can remain on the camera lens permanently. A scratched front lens element can not be repaired; and replacement is costly. Exchanging a damaged UV filter for a new one is more economical than the purchase of a new lens. The UV filter is utilized in connection with digital cameras, as well as in analog photography in color and black and white. What is especially important is the high optical and mechanical quality that B+W guarantees, since filters utilizing glass and/or coatings of a lower standard, reduce the performance of a lens. Filters as lens protection : Good lenses are far more expensive than filters, therefore it makes good sense to attach a filter to protect the lens sensitive front element. In order for this lens protection not to add a permanent filter effect, the protective filter should consist of clear, completely colorless glass with the highest possible transparency. These are precisely the characteristics of the B+W UV Filter, which furthermore also blocks the detrimental effects of ultraviolet radiation. |
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