[Leica] Strange M8 artifact

[tomschofield at comcast.net (Tom Schofield)]

You've discovered the undocumented Virtual Split Neutral Density  
Mode, Ken.

Tom

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.
>
>
>
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