John Francis wrote: > But there's no reason for the lens design to be any different. A design > that works for 16x24mm sensors will work for 24x36 sensors (or film). > There's more than enough image circle to spare, so there's no need for > (or benefit to be gained from) a different optical design. And if the > lens mount is the same (which it is, for a K-mount camera) then there's > nothing to make two different mechanical designs necessary, either.
Sure there is. Savings in weight and the materials that compose that weight. Reduced structural design and strength requirements because the entire assembly is lighter. Gimme a minute, I'm sure I can come up with more. By the logic you're using above, it seems to me there'd be no reason for them to have replaced the FA series withe DA series. I can't imagine how a 50-200/4.5-5.6 for full frame could be as small and light as the DA version. That could simply be a failing of imagination on my part, though. ;-) -- Thanks, DougF (KG4LMZ) -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
