Archived posting to the Leica Users Group, 2014/03/12
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]All lenses have some focus shift. If there is enough to move the point of optimum sharpness away from the point of focus chosen by the rangefinder more than the depth-of-field, your photos will be soft. Lots of Leica lenses have this much focus shift, but the 90 AA is not one of them. The f1 Noctilux and the 75 Summilux have a lot of focus shift, among others. If you use the 240 and focus using live view it doesn't matter. All the M lenses are made to tighter focus specifications and adjusted more accurately and precisely than they were when they were being made for film cameras, but there is only one version of the 90 AA. Marty On Thursday, 13 March 2014, Mark Rabiner <mark at rabinergroup.com> wrote: > I thought when the first dig M's came out the M8 and maybe M9 that because > the sensor is so flat compared to film it brought out focus shift to an > unacceptable level which was ok on curved film before. That's how I > absorbed > it at least. Has that been disproven? > Anyways I do have the lens. It cost me a bundle. And is it a reason for me > to try to get a new M? They upgraded the lens I think and are calling it > something else. > > > On 3/12/14 4:57 AM, "Marty Deveney" <benedenia at gmail.com <javascript:;>> > wrote: > > > Focus shift is a property of lenses, not cameras. The 90 AA > > has little focus shift but when using the rf the cam on many > > lenses does not follow the focus properly. Lenses that focus accurately > at > > infinity can be off at 10m and then on again at 3m all at the same > > aperture. Henning described it here: > > http://leica-users.org/v49/msg10637.html. I mistook it for focus shift > when > > I first got my M8. > > > > Marty > > > > > > > > > > > > > > > > On Wednesday, 12 March 2014, Mark Rabiner <mark at > > rabinergroup.com<javascript:;>> > wrote: > > > >> Are the older LEICA APO-Summicron-M 90mm f/2 ASPH - still focus > shifting on > >> the latest Leica M's? > >> > >> > >> On 3/11/14 10:47 PM, "Geoff Hopkinson" <hopsternew at > >> gmail.com<javascript:;> > <javascript:;>> > >> wrote: > >> > >>> The new 35 is designed to reduce the focus shift inherent in the older > >>> design. I do like it a lot. The 50 Summilux of course predates the M > (Typ > >>> 240) considerably. Both work really well on my camera. Focus system in > >> the > >>> new camera is refined further too.. Personally I wouldn't replace the > >>> Elmarit M 90 with the Summarit. It is a great performer already. > >>> > >>> > >>> Cheers > >>> Geoff > >>> http://www.pbase.com/hoppyman > >>> > >>> > >>> On 12 March 2014 12:43, Jim Laurel (gmail) > >>> <jplaurel at gmail.com <javascript:;><javascript:;>> > >> wrote: > >>> > >>>> It's almost as if Leica has upped their quality control game now that > >> the > >>>> M240 sensor is so demanding and there are so many pixel peepers. > >>>> > >>>> The only thing I don't really like about the new Summarit 90 is the > lens > >>>> hood, which is an extra expense, but even more problematic is that it > >> is a > >>>> screw-on instead of the handy slide-out one that came on the Elmarit > 90. > >>>> > >>>> --Jim > >>>> > >>>> > >>>> On Mar 11, 2014, at 7:43 PM, John McMaster > >>>> <john at mcmaster.co.nz <javascript:;><javascript:;>> > >> wrote: > >>>> > >>>>> I would say different, I tend to have old and new in my most used > >> lenses > >>>> for different looks... > >>>>> > >>>>> john > >>>>> ________________________________________ > >>>>> > >>>>> I went to the trouble of having my old Leica lenses coded, but have > >> also > >>>> picked up a few new ones, including the floating element 35mm Summilux > >>>> ASPH, the 50mm Summilux ASPH and, most recently, the 18mm Super > Elmar. I > >>>> think I'm going to sell all my old ones from the 80s and 90s. These > >> three > >>>> latest issues on the M240 are just fantastic. For some reason, I'm > just > >>>> missing focus less often with the 35 and 50 than my old 35 Summilux > ASPH > >>>> and Summicron 50. > >>>>> > >>>>> The only one I'm thinking of replacing next is the 90mm Elmarit with > >> the > >>>> new 90mm Summarit. But the Elmarit has served me so well for almost 20 > >>>> years that I wonder what more the Summarit might have to offer. > >>>>> > >>>>> --Jim > >>>>> > >>>>> > >>>>> _______________________________________________ > >>>>> 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 > >> > >> > >> > >> > >> -- > >> Mark William Rabiner > >> Photographer > >> http://gallery.leica-users.org/v/lugalrabs/ > >> > >> > >> > >> _______________________________________________ > >> 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 > > > > > -- > Mark William Rabiner > Photographer > http://gallery.leica-users.org/v/lugalrabs/ > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >