> I also saw a used Vivitar 2X teleconverter today. Apart from the > conventional wisdom about teleconverters in general, can anyone > tell me anything about it?
Hi, Toralf. I'm familiar with two models of Vivitar 2X TC's: The 4-element model (labeled something such as "2X-22") is not particularly good. (Actually, if not used with the right lens, and if not stopped down quite a bit, it's awful.) The 7-element Macro-Focusing 2X TC, on the other hand, is quite good, similar in its results to the Pentax T6-2X and A 2X-S TC's, and it is quite versatile, too, with its helicoidal focusing mechanism for macro (or, at lest, closer focusing) work with regular lenses. I'd avoid the former but I'd recommend the latter. Fred
