The flares I have found has more to do with quality Ithink the ones in your link seem to cheap to me or is this just me I go for Hoya or branded Canon ones it seems silly to have an expensive lens and crap glass filter

Danny O'Byrne  http://www.digitalartzone.co.uk/

"All the technique in the world doesn't compensate for the inability to notice" Eliott Erwitt