> Don't most manufacturers make "long" and "short" TCs, though?
Well, Pentax really doesn't. (Well, perhaps the L models are intended primarily for longer lenses, but Pentax does not say to avoid using the S TC's with longer lenses, but only to use the L models on lenses that they fit.) > In your opinion, how well does the Vivitar work in the 200-400 > range? I've never used it with a 400mm lens, but I've used it a few times with the A* 300/4, where I think it performs similarly to the A 2X-S. Fred
