The bandwidth of the Baader UHC-S is so wide, it should be thought of as a "broadband" filter. The Baader O-III filter, on the other hand, is so narrow it should be thought of as more of a photographic filter than a visual filter.
Take a look at this thread:
http://www.iceinspace.com.au/forum/s...d.php?t=117915
to get some links and a better explanation.