Originally posted by Digitalis *the glass used in lenses these days is absolutely terrible at transmitting UV light, so using UV cut filters is pointless for every day shooting conditions.
Actually the UV light in modern cameras is removed by the filter on the sensor, not by the lens. There are camera conversions out there that can replace the IR/UV filter on the sensor with a completely clear one. Doing this allows cameras to capture more astronomical features in astro photography, features that would normally be eliminated by the original sensor filter. And I'm not referring to just IR conversion here, I'm referring to a full IR/UV conversion. This is true with the use of any lens, although some lenses do cut out more UV light than others.
Having said that, the filter on the sensor does in fact eliminate UV rays very reliably, probably enough to make UV filters fairly useless as far as removing UV light. But as the article I linked to points out, most good quality UV filters have no noticeable effect on light transmission at all above the UV spectrum. Typically, the high quality UV and clear filters from the same lineup have the exact same performance and cost about the same. The only difference is that a good UV filter cuts out the UV light before it enters the lens rather than letting the filter on the sensor do it.
Is that beneficial? Probably not. But it doesn't hurt either.