I think that it is a pretty good tele-extender, although I never compared it to an expensive 7 element one. It one of the better ways to get an 85mm AF portrait lens (with a 50mm). The elements move to provide the AF capability, so it only works over a particular distance range that varies with the particular lens being used.
BR > -----Original Message----- > From: Michael Cross [mailto:mcross@;ncen.org] > I am particularly interested in the image quaility loss and autofocus > performance. > > Thanks! > > Michael Cross >
