A Merry Christmas To All

vincent W wrote:

Hi Bassotoo

How's going on about your replacing CMOS glass filter?

Is there any new information about the spare part sensor filter?

I ever checked that the glass might be coated by MgF2 coatings, which might be etched or even exchanged under humid condition.

If you could, try some dilute HF solution to swap on the white spots for dissolving them.

WHY?

It is believed the Na+ ion was migrating into MgF2 layer to replace the Mg into NaF.

MgF2 + 2Na --> 2NaF +Mg 2+

after the contacting to humid air, the water molecule react with Mg

Mg2+ + 2H2O --> Mg(OH)2 + H2

The magnesium hydroxide was appeared as white powder such like the white spots on filter surface.

You can try this using the broken filter to ensure the phenomena described.

Good luck