I may well be wrong on that Jim and will play around a bit more to see exactly what I am getting. Most of the reviews of the converters or teleconverters complain of loss of stops.
I see a full frame body in my not so far away future and the idea of converting my A550 sounds appealing (for the moment anyway). Then again, if I sold off all of my Rokkor-X stuff the new body might be quite a bit closer.
High Def video and Live View sound nice