hi, anybody can recommend me some good teleconverters for use with my canon g3? i tried the vitacon 2x one and was disappointed cos it was at most just 1.5x only. heard about the 2.4x canon TCDC52, is it good and how much is it? are there any more good 3rd party teleconverters? or do i have to use those branded ones like the olympus tcon70?