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The Truth About Dust and Sensors

km6xz

St Petersburg, RU
3574 posts

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"RE: The Truth About Dust and Sensors"

km6xz Moderator Awarded for his in-depth knowledge in various areas, including Portraits and Urban Photography Nikonian since 22nd Jan 2009
Wed 12-Dec-12 09:18 AM

Since I do a lot of diagnosis in various fields, mostly electronics but also business and mechanics, I seek out evidence that I can be confident in and find a possible solution that fits all the symptoms, if a theory does not fit all the evidence it is wrong.
So we have only one long term test with reliable evidence so far, that from LensRentals which in the past has proven to be a good source of methodical repeatable observation over dozens of examples with good record keeping. Since just about any mechanical defect such as the often suggested shredding of the shutter curtain would have additional symptoms such possible symptoms include inconsistent exposure times at a given setting, and the residue increasing with time and wear, we have a strong case for concluding the shutter curtains are not the cause since those symptoms are not reported. The dust starts from the beginning of use and accumulates more consistent witht the random deposit of air-born particular matter than a wear or failure mode generation of particles.
The nature of the particles themselves suggest multiple sources, since size, density and material vary according to close microscopic inspection by two members with inspection microscopes. I have one but no D600 with dust. The conclusion that LensRentals came to with dozens of sample units with inspection and cleaning every time the cameras were sent out and received, notes that each cleaning reduces the number of particles seen in the next inspection which also supports their conclusion that the source was a one time deposit of particles inside the camera without new material being generated.
Based on a strong background in diagnosis of failures, the evidence points to a static on-time source of particles, not continuous generation. So the odds are greatest that the one-time event of manufacture theory fits all the evidence that can be relied on, so far and the defective camera thories fail to fit the evidence in several points. That is why I wrote that it was more like the windshield than a gear box, the evidence tell us that.
Stan
St Petersburg Russia

Visit my Nikonians gallery.

This is a hot, active topic! The Truth About Dust and Sensors [View all] , mpage , Sat 01-Dec-12 10:19 AM
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