Here's the link for you Randy .. about that IS-thingie, i think, it'll be of interest to some other people too .. There are shots with even using the 1.4* and the 2*converter together on a 70-200 on his site (over here)... 8^0 click here - read a while ... the important parts come in the second half .. Another comparison .. with another conclusion: over here .. So whom to believe?