Filters are ideal help to reveal different points of view, although now we have a lot of software that might have turned them obsolete. Dirt, greasy fingerprints, water marks and scratches reduce the image contrast and the sharpness, which can result in blooming at light sources and have an effect similar to a soft-focus lens.
An added benefit is that their filters remain free of dirt longer, so that they do not have to be cleaned so often. :)
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