Archived posting to the Leica Users Group, 2007/04/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Ken, Not to minimise the potential problem, but here in the South it just looks like she wears short sleeve clothes most of the time and her tan line is a little uneven. To replicate, try shooting some white seamless where any change will be obvious. Or possibly a black polyester textile that covers the full frame at two meters. On 4/25/07, Ken Iisaka <ken@iisaka.org> wrote: > > I recently encountered a strange M8 imaging artifact in which two halves > of the sensor appear to have different sensitivity characteristics. > > http://gallery.leica-users.org/v/kiisaka/LeicaM8/RachelSirois.jpg.html > > In this photograph (cropped slightly from the original), the shadow level > is slightly higher, and slightly more magenta in the bottom half (or the > right half) of the sensor than the top or left half. If you look using a > carefully adjusted monitor, you will see the line just below the pendant, > which is exactly 1952 pixels (3904 / 2) from the top, exactly at the middle > of the sensor, in the original. > > Has anyone noted anything like this? My hypothesis is that the overblown > areas from the window is affecting the circuitry for the one half of the > sensor. This problem was observed in three nearly identical shots that were > taken within 10 seconds of each other. > > The camera was M8, firmware 1.102, Summilux-M 35mm ASPH, B&W 486 filter > > I will conduct more tests to see if I can replicate this problem. > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > -- Don don.dory@gmail.com