On Thu, 5 Oct 2006, John Celio wrote: >> Because there's no actual gain from making a subframe lens at that >> length, so no reason to do a DA lens. > > Could you explain further? I was wondering why the long lenses were D-FA > too, and I'm not sure I understand what you mean.
Not sure anyone replied concretely: a 400 f4 requires (by definition, no design can change that) a 400/4=100mm diam front element. ~4 inches. How is that for reduced image circle :-) Kostas -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
