Archived posting to the Leica Users Group, 2009/08/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Stop it, Geoff. You're killing me :-) It's almost always true that at a zoom design, the tele-end suffers. At 60/F4, it's wide open for that zoom. Now look at the 'rait at F2.5, wide open. Not so great anymore, is it? Lets ignore the price / performance etc. Leica will never win there. Seriously, enjoy your Leica, as do I. The Leica lens is probably better, but much sharper and slaughter other SYSTEMS on its path? Not likely. On Thu, Aug 13, 2009 at 4:16 PM, Geoff Hopkinson<hopsternew at gmail.com> wrote: > Richard, it is just a broad comparison as you say. However, your examples > actually do show the superiority of the Summarit quite clearly. > Just to pick the most obvious the 60 (at f/4.0) looks to reproduce about > 92% > MTF at 10 lpmm which is the least demanding measurement. Just ignore where > the fall off begins as the four thirds sensor is disadvantaged there and > you > can't compare the dimensions directly. The Summarit (at f/5.6) is providing > it looks like about 96-98% at the same lpmm. That is a significant and > important difference for contrast and resolution if you care about > theoretical best performance. I am NOT saying that the 12-60 in that system > doesn't perform well. I am saying you really don't want to pick a fight > with > Leica primes on MTF diagrams ;-) By the way, the Summarit of course is not > leading edge, it is a less expensive spherical design to offer an > alternative price point. It might say something about Leica customers that > they are outsold 2 to 1 against the more expensive 50! The best comparison > to that particular range would be the excellent Zeiss ZM designs. In Solms, > Leica has some large prints from the Summarits about one metre wide on the > factory wall. Very impressive indeed and you can even press your nose > against them to 'pixel peep' the prints. -- // richard m: richard @imagecraft.com // w: http://www.imagecraft.com/pub/Portfolio09/ blog: http://rfman.wordpress.com // book: http://www.blurb.com/bookstore/detail/745963