Archived posting to the Leica Users Group, 2007/04/25

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Subject: [Leica] Strange M8 artifact
From: len-1 at (Leonard Taupier)
Date: Wed Apr 25 15:25:32 2007
References: <W286416247284351177529021@webmail30>


This looks like a different problem. Even though the line goes into  
the left arm, it really only affects the black fabric. Is the lens  
coded and the firmware set to recognize the filter?


On Apr 25, 2007, at 3:23 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.
> 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.
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In reply to: Message from ken at (Ken Iisaka) ([Leica] Strange M8 artifact)