Archived posting to the Leica Users Group, 1999/07/03
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]SNIP -- Jim Brick wrote: The extenders limit the maximum aperture of the taking lens to f/2. Therefore, a 2x on an f/1.4 lens, e.g. the 80/1.4, will turn out to be a 160/4 lens. The 1.4 f/stop isn't usable so you cannot get a 160/2.8 out of it. Just f/2 which = f/4 with extender. In addition, anywhere the APO 2x extender can be used, so can the non APO 2x extender. Only with, perhaps, less resolution in the result. SNIP -- Thanks Jim -- Not having a f/1.4 in an R lense, I was not aware of the f/2.0 limitation. The commonality as to the applications of the extenders-R, APO 2x and the 2x, I suspected, but was not sure about. Bill Caldwell Northern Virginia