Archived posting to the Leica Users Group, 2020/05/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Doug. Will do. And thank you for the ?how?. On Mon, May 25, 2020 at 4:45 PM Douglas Barry <imra at iol.ie> wrote: > Frank, crop a couple of salient bits and post them on the Lug Gallery, > with the larger photo as a smaller jpg at 1920 pixels across so that we > can get some context. Never mind your reservation about the possible > imperfections of perception. I've been battling against my own > imperfections since birth = and failing :-) > > Douglas > > On 25/05/2020 22:48, Frank Filippone via LUG wrote: > > If anyone want to actually see for themselves the differences, I would > > be happy to email them directly 2 files... But the RAW files are > > like 80MB each.....and I will not send out jpg files, because it is > > the wrong way to see the differences.... > > > > Maybe I can try to do some cropping.... let me try... Will report > > back.... > > > > > > Frank Filippone BMWRed735i at gmail.com > > On 5/25/2020 1:53 PM, Douglas Barry wrote: > >> Sample images??? > >> > >> On 25/05/2020 21:18, Frank Filippone via LUG wrote: > >>> If you own or have contemplated the purchase of a Sony A7 series > >>> body to use with your Leica M lenses, you have heard that Leica WA > >>> lenses show smeared corners due to the closeness of the lens to the > >>> sensor.. the image ray's angle causes problems. > >>> > >>> A company, KolariVision, has a modification to the A7 series that > >>> replaces the standard cover plate ( the one that fell OFF my M9) > >>> with a very thin glass cover plate ( I think it is 0.2mm thick. the > >>> Leica OEM plate is approx 2mm thick). This improves the image > >>> quality in the corners of the frame.... So the question is, if I > >>> read all the literature, is any or all of it true? Is it just > >>> marketing BS? > >>> > >>> I went testing ( yes, again). > >>> > >>> One of the most awful lenses for this problem used on the Sony A7 > >>> bodies that Leica has made is the 28 Summicron ASPH. V1. > >>> > >>> One of the best lenses on the Sony bodies is the WATE... 16/18/21mm > >>> F4 Wide Angle TriElmar I tried both. I also tested a 21mm SEM, > >>> because I was asked to. > >>> > >>> The cameras were setup identically. The only thing that changed in > >>> this test was the body.( Tripod, same shutter speed, same apertures, > >>> same lens.... ) > >>> > >>> ::::SPOILER ALERT:::::: > >>> > >>> The Kolari modified body FAR exceeded the IQ of the unmodified body > >>> in the corners... > >>> > >>> A7rii vs A7rii Kolari > >>> > >>> With 21mm SEM and 28mm Summicron ( notoriously bad on Sony bodies) > >>> > >>> At ISO50 > >>> > >>> At Fwide open, F4 and F8 > >>> > >>> Distance from camera to center of image was about 15 feet. Tripod of > >>> course. > >>> > >>> The camera body was place at an angle, allowing for easy access to > >>> the corners ( the horizon line was set corner to corner) ...... > >>> Essentially stressing the lens corner quality as much as possible..... > >>> > >>> Focusing was done by x10 focus enlargement in MF mode in the center > >>> of the image...... I did not focus in the corners.... I use a > >>> ground glass kind of focusing, no high tech stuff. When it LOOKS > >>> sharp it IS sharp. > >>> > >>> Focus was not done at each F stop... it was done wide open only. > >>> Care was taken to not move the focus ring when changing aperture. > >>> > >>> In the center of the frame, there was little to no difference in the > >>> images. The cameras produced very similar images.... see comment > >>> below about the color shift..... > >>> > >>> There was NO condition where the Kolari modified body did not beat, > >>> by a large amount, the corner sharpness of unmodified A7rii. NONE. > >>> 21 SEM, WATE, 28 Summicron V1.... All the same result. > >>> > >>> I also added on the M240/28mm Summicron as a test vehicle against > >>> the Sony body.... The Kolari body BESTED the Leica body. Not by as > >>> much as the Kolari bested the unmodified body, but it was pretty > >>> obvious. > >>> > >>> There is no question in my mind, that the Kolari Modified thin glass > >>> cover plate was a BIG improvement to the lenses tested, and I am > >>> willing to bet, it is a big improvement to ALL WA lenses...... > >>> > >>> Further note: There is a color difference between the Kolari body > >>> and the Leica or Sony unmodified bodies. The color shift is > >>> expressed as a purple tint in the Kolari modified body. Especially > >>> in the gray areas.... > >>> > >>> I should have shot a white card and color corrected on that..... > >>> maybe another day..... > >>> > >>> I am pretty anal when I do these tests. I am careful, I look at the > >>> images 1:1 in comparison mode in LR. The results are correct. > >>> > >>> If you want to up your Leica IQ game in the corners.... send a Sony > >>> A7 family body and $400 to Kolarivision, and get it done. It is > >>> cheaper than buying a M-60MP body will be..... > >>> > >>> I did not test native lenses on the modified body. Maybe another > >>> day...... > >>> > >>> Paul Roark ( who found this out for himself several years ago and > >>> got me thinking down this path) ... want to add anything? > >>> > >>> > >>> PS: If you type in only Kolari to your Google search, I think you > >>> get a porn site.... You will figure that out pretty easily. It needs > >>> to be www.KolariVision.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 -- Frank Filippone BMWRed735i at gmail.com