Archived posting to the Leica Users Group, 2014/05/01
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]The loss of detail away from the center has been shown to exist on the A7R with rangefinder lenses as long as 50mm, and gets worse as the focal length is shortened with symmetrical or near symmetrical lenses. It definitely is a problem and is much worse than the mtf diagrams would suggest. Yes, the flat field plug-in works, but just as with cornerfix an increase in noise is unavoidable as the exposure levels in the corners are increased to compensate for the severe corner light fall off. The color shift is fixable without too many penalties, but similarly the distortion of other lenses is fixable with few penalties, and that often is more easily dealt with in post processing. I'm a fan of symmetrical wide angle lenses, and as you say, in the film era the f4/5 Biogon would have been the star, except for speed. Now it's not as compelling. Henning On 2014-05-01, at 7:12 PM, Dante Stella <dstella1 at ameritech.net> wrote: > Smart-aleck answer: there is no plug-in to correct apostasy. > > But seriously, I've checked this as much as possible in real life, and I'm > not seeing what has been shown in connection with the various Sony > cameras. One thing is obviously that the Sonys don't have offset > microlenses the same way that Leica does. Another is that the Sony sensels > are smaller. > > There is some corner falloff in sharpness at the extreme corners, but it > looks a lot like what the MTF charts predict. > > Dante > > On Apr 20, 2014, at 11:06 AM, Paul Roark wrote: > >> On the Sony, at least the A7R, it's the smeared details that are the >> un-fixable defects, not the "Italian flag" color. >> >> Paul >> www.PaulRoark.com >> >> >> On Sat, Apr 19, 2014 at 7:35 PM, Dante Stella <dstella1 at >> ameritech.net>wrote: >> >>> Good news if you like tiny, distortion-free, symmetrical wide angle >>> lenses. >>> >>> I've posted a review and tutorial here. In short, some new software makes >>> the current Zeiss 21/4.5 completely usable on the M typ 240, and the same >>> techniques could be used to process files shot with other M lenses or >>> where >>> an M or LTM wideangle is used with something like a Sony A7. >>> >>> http://wp.me/p2RAff-7 >>> >>> Dante >>> >>> _______________________________________________ >>> 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 > Henning Wulff henningw at archiphoto.com