I thought the 200f was the holy grail--sharper with lens wide open. I always
read on this list the zuiko 1.4TC was a tad better than the Tamron 1.4 and
the usual 2X about the same.
With all the aspheric elements these days it seem TC's will work for one lens
only, if that.
Themed Olympus Photo Exhibition: http://www.tope.nl/