A guy in my town is selling a bunch of shit and says he'll let a 2X Tamron AF TC go for 50 bucks. Now, I don't expect this thing to be tack sharp but if it works decently stopped down it would be nice to have in my bag. Also, does anyone know if the 70-200 f2.8 L IS will retain focus with this thing on a 30D? Any help would be great. Also, it's not the SP (white) converter.