This is an area of dispute among photogs.
I think UV/skylight do not add to the quality of dSLR shots. However, they do protect the lens. On Canon's lens site, they recommend always having one on a lens unless you replace it with a different filter such as a polarizer. On the down side, under some conditions, they may add to ghosts and flares. Some recommend only using expensive multi coated filters to reduce the above, but according to popular photography, they report that they couldn't see any difference between cheap an dexpensive filters.
If you look at this picture that I took with the kit lens and a sunpack UV filter,
//yido.smugmug.com/gallery/574275/1/24051256
you can see ghosting by the lights. I think this was a 15 second exposure in dark with a bright light in the center. So it is an extremem lighting siutation.
In retrospect, I should have removed the filter, but to me it didn't make much difference to me.
I personally stick to cheap name brand filters and when I encounter difficult lighting situations, I take it off.
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