M9M sensor replacement poll....

[willie_901]

Can anyone supply an image that clearly shows what the corrosion looks like?

I bought my MM second hand, with documented proof of a sensor replacement. 95% of the time the shots are clean, the other 5% show dark spots in the sky.

Here is a link to many examples of M9, water-vapor induced corrosion. Just click on the "images" link at the top of this page.

 

[Rob MacKillop]

Thankfully my spots look nothing like those images of corrosion. I just need my sensor cleaned. Thanks for the help, folks.

 

[james.liam]

Thankfully my spots look nothing like those images of corrosion. I just need my sensor cleaned. Thanks for the help, folks.

Stop down to f/16 or 22 and shoot against a blue sky. It will be most apparent that way.

 

[Rob MacKillop]

Will do, James. The problem is getting a blue sky in Edinburgh!

 

[willie_901]

...

Truth be told, I could of lived with the corrosion because it had a minimal effect. Only slight traces, and only on some images.

The corrosion is caused by a chemical reaction between water vapor and the sensor cover-glass, IR-filter layer, eventually the corrosion must become worse. Even though the rate of increase could be rather slow, you were wise to take action when you did.