I need to have a lightweight telephoto system for the moment, and the OM-D along with the four thirds adapter and the 150mm f/2.0, 90-250mm f/2.8 and 300mm f/2.8 lenses and the teleconverters seems to fit the bill. Can any users of the system / these lenses comment on the accuracy and speed of the autofocus using these lenses with the adapter on the mft body, as well as with the teleconverters, if this changes anything. I have read some places online that you loose some of the AF capabilities of the OM-D when you are using the adapter and these lenses, help would be greatly appreciated since I know very little about these systems. Also any comments on using these telephotos on the mft body would be welcome, I shoot the Mamiya 300mm f/2.8 APO and 500mm f/4.5 APO lenses along with a 2x TC on my PhaseOne, and have shot telephoto's on my Nikons. I also shoot Leica and Hasselblad and this will be my first foray into smaller-then-full frame sensor formats so help would be greatly appreciated.