Archived posting to the Leica Users Group, 2007/08/08
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Thanks, I found it. The graphs are there and the numbers are the same. Len On Aug 8, 2007, at 3:53 PM, A. Lal wrote: > Around 1999-2000 the site fell into disrepair. The old site and > graphs can be accessed from this address: > > old.photodo.com > ----- Original Message ----- From: "Leonard Taupier" > <len-1@comcast.net> > To: "Leica Users Group" <lug@leica-users.org> > Sent: Wednesday, 08 August, 2007 3:21 PM > Subject: Re: [Leica] Summarit press release > > >> Mark, >> >> I recorded this data about three years ago. I believe it was from >> Photodo. They have since removed this data. New management I think. >> >> Lens f2.8 f4.0 f8.0 Rating >> >> Canon EF 50/1.8 77 81 85 4.2 >> >> Contax Planar 50/1.7 78 86 88 4.6 >> >> Leica Summicron 50/2.0 81 85 87 4.6 >> >> Nikon AF 50/1.8 78 83 86 4.4 >> >> These are resolution numbers. In this focal length nearly all >> lenses made are old designs and very similar. The differences are >> glass types and manufacturing tolerances. >> >> Last week I ran resolutions tests on seven Leica 50mm lenses. >> They were the 3.5 Elmar, Summarit, Summitar, Summicron >> Collapsible, Summicron Rigid #1, current Summicron and Noctilux. >> The lens with the highest resolution was the Summicron Rigid #1 >> made in 1958. However it wasn't the sharpest. Most of the lenses >> had very similar resolution numbers. The difference was contrast. >> The current Summicron was by far the sharpest of all. The >> contrast was easily the best. I would have included my 50mm >> Summilux Asph but it's at Leica, NJ being coded. It's better then >> the Summicron. At some point after 1958 Leica started optimizing >> their lenses for contrast, not resolution. >> >> I have 3 of the 4 lenses from the Photodo test. I see the Leica >> as the best. And the proof is in the photos, not the test charts. >> >> I know. I have a lot of time on my hands. But I'm an engineer and >> this is what I do when I'm not taking photos. It's relaxing. >> >> Len >> >> >> On Aug 8, 2007, at 2:41 PM, Mark Rabiner wrote: >> >>>> Frank, >>>> >>>> I have the 50 Summicron, and it certainly knocks my socks off. >>>> No complaints >>>> of its performance in my book. >>>> >>>> Gene >>>> >>>> >>> >>> The results from my Summicron m always looks great. >>> >>> But the specs put others in front of it. >>> >>> The design is 28 years old. >>> That's a long time in this day and age of computer this and >>> special coatings >>> that. Newer glasses perhaps. >>> >>> Mark William Rabiner >>> Harlem, NY >>> >>> rabinergroup.com >>> >>> >>> >>> _______________________________________________ >>> Leica Users Group. >>> See http://leica-users.org/mailman/listinfo/lug for more information >> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information