RF Prism Decementing/Dessilvering?

[mamypoko]

Hi all!

Does anyone know if the RF patch on my M2 is decementing or desilvering as per the image below.

Both images when I focus are still pretty bright though.

Thank you for your help 🙂

 

[Keith]

I had an M2 that was starting to do this ... Youxin Ye CLA'd the camera and told me not to worry about it too much as it was fairly common on M2's and is a very slow deterioration process.