Archived posting to the Leica Users Group, 2000/02/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]dominique pellissier wrote: > > ----- Original Message ----- > From: Dan Cardish <dcardish@microtec.net> > To: <leica-users@mejac.palo-alto.ca.us> > Sent: Sunday, February 13, 2000 5:33 PM > Subject: Re: [Leica] Apo-Summicron-M 90/2.0 ASPH tested by CDI > > > Are you looking at the same MTF charts that I downloaded from the Leica > > site? The APO 90 MTF at f2 looks excellent, at least the way I interpret > it. > > > > Dan C. > > > > At 05:03 PM 13-02-00 +0100, dominique pellissier wrote: > > >> > > >################ > > >On the official Leica site, there are some MTF tests. > > >If you see the test of the apo90, there is no doubt : at full aperture, > this > > >lens is not an absolute winner. > > > > > >Conclusion : don't buy the apo90 if you have the old90. > > > > ########### > Yes. > At full aperture, the contrast is 52 %. At 5.6 : 72 %. Great difference. > By comparison (yes, i know, it's not very rigorous to compare lenses of > different focal lengths) the 2.8/180 apo gives 82 % at full aperture and 82 > % at 5.6. > Now, let's see the CDI tests for these 2 lenses. > For the apo90 : good (center), good (edges) at full aperture and excellent, > very good at 5.6. > For the apo 2.8/180 : very good, very good at full aperture; same results at > 5.6. > The 2 tests are corroborated. > > Leica writes : " The overall performance measures up to the legendary LEICA > APO-MACRO-ELMARIT-R f/2.8/100 mm from the LEICA R system." > It's true. But not at full aperture for the 90. > > I keep my elmarit 90... On the official Leica site???? Erwins tests indicated the 90 APO ASPH M is excellent wide open. I'd believe Erwin first until proven otherwise. But I'm still keeping my Elmarit! ribit ribit Mark