Strangest dust on sensor you've ever heard

[kiwidad]

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16 hours ago, marchyman said:

 

That particular kit is good for 12 cleanings (contains 12 sealed swabs).  That is about $2/cleaning.  Seems cheep to me.  Given that I've need to do a wet cleaning exactly once in the 8 years I've owned an M (first the M 262, now the M11) it is quite possible the kit will outlast me.

One time I have wet cleaned and got a perfect result the first time. Usually its a two swab affair. Currently I seem to have a small area that's stubborn (in an image its along the top left edge and and I have used 4 and its still not quite perfect... 

At what magnification are you checking for dust?

The M11 seems to be a dust magnet compared to the M10 I had

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[jaapv]

There are corner swabs available to address this problem. 

[marchyman]

8 hours ago, kiwidad said:

At what magnification are you checking for dust?

I look at the images full screen in Lightroom on a 27" 5K monitor.   I also use that monitor as the dust detection target, opening an empty file in a text editor and making it  full screen in "light" mode.  The following examples were reduced to 1K long edge.  The dust can still easily be seen.

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After using brush:

Notice that the brush made the dust on the bottom worse.  That indicated a wet swab was needed.  After a wet cleaning:

These examples are from an M 262.  So far I've needed nothing more than a blower to keep my M11 images relatively dust free.

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On 8/22/2024 at 2:18 AM, nek724 said:

Here's the funny part, so ultimately I noticed that by zooming in the frame during live view at the second zoom I see it best. But what's really strange is that when I tilt the m11 up the dot goes down, when I tilt down the dot goes up. Same with left and right, it goes the opposite direction. In the end, I noticed that it actually stays within a rectangle invisible frame how ever I move the body. Never seen this before!

I didn't think of this before, but now I do and this is it: I seem to remember that Leica made a camera with a covering glass sheet some distance before the sensor. This way, you'd not see any dust on the sensor unless it was a very large particle and until you stopped your lens down as far as it would go. Any dust being some distance in front of the actual sensor might produce that effect, that its image would appear to go in the opposite direction as you tilt your camera.

That is, unless I am utterly confusing a few things.