On the M9 and M Monochrom: Leica did not replace just the cover glass. They replaced the entire CCD and Circuit board. OnSemi switched to BG55 glass and for the M9, used a new Dye formulation for the Bayer filter. This is at a time that DigiKey charged ~$4000 for just the CCD. Leica took 4 months to replace the KAF-18500 on my M Monochrom, did it for free. The M9- had it back in under a month, was $900. the camera was ~8 years old at the time, so not much more than a CLA with 1 year warranty. Knowing the full price of the CCD from Digikey, it was a bargain. The only reason Leica stopped replacing CCDs in the M9 and M Monochrom is that OnSemi shutdown manufacture of all CCDs. Dalsa also stopped. They are extinct.
The M8- used an IR filter that will not corrode, but has a 5% leakage in IR. Leica provided Two UV/IR cut filters free of charge. Those of us that used Digital cameras in the early 90s, such as the Kodak DCS200 and DCS400 series- knew all about IR leakage and the need for IR cut filters. I had several when I bought the M8 in January 2010, 3 months old, 400clicks, $2500 with two batteries. My complaint with the M8 is the stupid -TRULY STUPID- lossy compression used for the DNG file. After learning the Button Dance and M8RAW2DNG- much better DNG files.
ANYWAY: very few manufacturers serviced cameras so long after the warranty expired, the problem caused by a commercial part that was flawed. The engineers that decided to use S8612 cover glass should have known better. Kodak liked that glass, used it for their DSLR's. They could make a thick sandwich of it, could not do that on the Leica M-Mount. I blame Kodak for the choice in cover glass, and deciding that a thin coating would be all that was required to stop the corrosion. It is Schott glass- I do not know who applied the coating, or what idiot ignored the Schott Data Sheet that states the S8612 should be made into a sandwich using stable glass to keep moisture out. I am reasonably sure it was a different idiot than the one that came up with the M8 DNG-8 compression scheme.
The M8- used an IR filter that will not corrode, but has a 5% leakage in IR. Leica provided Two UV/IR cut filters free of charge. Those of us that used Digital cameras in the early 90s, such as the Kodak DCS200 and DCS400 series- knew all about IR leakage and the need for IR cut filters. I had several when I bought the M8 in January 2010, 3 months old, 400clicks, $2500 with two batteries. My complaint with the M8 is the stupid -TRULY STUPID- lossy compression used for the DNG file. After learning the Button Dance and M8RAW2DNG- much better DNG files.
ANYWAY: very few manufacturers serviced cameras so long after the warranty expired, the problem caused by a commercial part that was flawed. The engineers that decided to use S8612 cover glass should have known better. Kodak liked that glass, used it for their DSLR's. They could make a thick sandwich of it, could not do that on the Leica M-Mount. I blame Kodak for the choice in cover glass, and deciding that a thin coating would be all that was required to stop the corrosion. It is Schott glass- I do not know who applied the coating, or what idiot ignored the Schott Data Sheet that states the S8612 should be made into a sandwich using stable glass to keep moisture out. I am reasonably sure it was a different idiot than the one that came up with the M8 DNG-8 compression scheme.
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