I was reading on another forum about teleconverters, and someone over there had stacked a 1.4 and 2.0 converters together on an f2.8 lens, and had decent results. I realize its less than optimal, but if the wolves are a long way off, and that's the only way to get the reach; its better than no picture at all, right? Has anyone ever stacked a 1.4 and 1.7 onto a 300 f2.8? Will they even stack together? Thanks to Alex and Geno, I have a new-to-me 300 f2.8, 1.4 TC and 1.7 TC on the way. I can't wait . . . . my first expensive lens . . . did I say I can't wait? Anyway, just wondered if I can stack the TCs and play with it.