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Bifurcation issues reported in the M11m?


RMF

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As a former owner of an M10m I’m considering buying an M11m but want to see if there are any reports of birfurcrion issues with the sensor/camera?  My M10m showed the bifurcation issues in the typical circumstances as reported in the forum (plan flat surfaces, turning up the settings in LR, etc..) but after searching this forum in various threads, I  haven’t seen any reports of the issue with the M11m?  Have any M11m owners experienced bifurcation in their photos?

thanks

Edited by RMF
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By bifurcation, do you mean two APS-C sensors by joined to form one full frame sensor (ie - 18x24 + 18x24 = 36x24)?  If so, I don't think that's how the M10-M or M11's sensors are produced.

I routinely use dark red filters & polarizers, and with the subsequent edits, the files are purchased very hard.  If these center were produced that way, those extreme contrast setting would very likely exasperate / provoke any such centerfold issues.  I've never seen any hint (1000s and 1000s and 1000s of images) of two sensor halves being stitched to form a full-frame sensor on the M10-M or M11-M.

I'm familiar with this issue, more commonly referred to as 'centerfold'.  Alot of CCD digital backs were made this way, such as the CCD's from Dalsa.  I saw it on the Leica S-006 and the Phase One P65+.  My point being, I have know what to look for it because fixing it can be really difficult to fix in post.

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@John Black Quite a few threads on the forum about the issue with the M10M. Here is one of them with samples (see post #48, and also starting at #72, #165…) I only noticed it infrequently with my M10M but it was possible to repro with specific settings in LR. Just curious if anyone encountered it with their M11m.

 

 

Edited by RMF
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I bought my M10M in 2022, new. I've tested and tested and can find no evidence of bifurcation. It also arrived in the box with absolutely flawless finish and no dust on the sensor or anything like that. 

G

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  • 4 weeks later...
  • 4 weeks later...

I assume M11M has same sensor as M11, if so yes it could have bifurcation issue.

My 2 year old M11 has bifurcation issue, but it's not affecting day to day usage. I only see it on a flat one-colour picture and tune way up in the C1.

I don't bother to send it to the factor to fix that.

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The problem is not a stitched sensor but the electronics. For reading speed the sensor is read out in two halves, each with its own ADC and other electronics. If those components are not within tolerance there may be a centerfold visible. Normally this will be corrected by a calibration file but that may be out of sync. The solution will be a motherboard replacement. So yes, an M11 like any other digital camera can in rare cases display this fault. 
Although sensor stitching was common for CCD sensors it is not widely used for CMOS sensors. 
https://www.photonicsonline.com/doc/tech-briefsstitching-produces-high-resolution-0001

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Posted (edited)

Anyone quoting Digilloyd is totally buying into his problems with Leicas. Also his pseudo friend "Roy" has the same problems. He often makes mountains out of mole hills.

Never had any problems with my M10M using C1, so perhaps the problem is LR.

Edited by algrove
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On 4/7/2024 at 4:05 AM, algrove said:

Anyone quoting Digilloyd is totally buying into his problems with Leicas. Also his pseudo friend "Roy" has the same problems. He often makes mountains out of mole hills.

Never had any problems with my M10M using C1, so perhaps the problem is LR.

i can only second that

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