Re: Tele-converter, Pentax, Pentax or Vivitar, at wich price?

[Fred]

> you'll have the equivalent of a f16 400mm with any if these 
> converters

Well, a 2X TC used with a K 200/4 would give you 400mm at ~f/8~
(but, of course, you would then usually stop down, if possible).

Fred