Just in case if you're interested:-http://www.lenstip.com/113.1-article-UV_filters_test.htmlThe Spectrophotometer, i.e., light spectrum analyser:-A typical result:-Btw, they also tested the flare introduced by the filters by taking real photos, with and without the filters side-by-side and the result pictures are posted, like this:-Last but not least, the visible light transmission rate, UV light
