Archived posting to the Leica Users Group, 2007/04/27

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Subject: [Leica] Strange M8 artifact
From: grduprey at mchsi.com (grduprey@mchsi.com)
Date: Fri Apr 27 07:11:14 2007

even after full screen i do not see anything wrong.  

gene

-------------- Original message from Tom Schofield 
<tomschofield@comcast.net>: -------------- 


> I didn't see it until I went full screen. I'll bet its a reflection 
> off the window because it appears to have the window pane iine in it. 
> 
> Tom Schofield 
> 
> 
> On Apr 25, 2007, at 12:23 PM, Ken Iisaka 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. 
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> 
> 
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