What does your car being dinged or not being dinged have to do with fungus on the IR glass of a MFDB? Absolutely nothing. Maybe it was just random? Maybe someone knew it was your new car?
What does fungus on any other type of glass such as lens have to do with this very specific issue? Not much except it is glass. The question is why is the IR glass on MFDB prone to this problem? Most likely it is due to the make up of the IR glass, and the heating & cooling that it goes through as compared to lens glass.
Theirry from Sinar stated that Sinar had a fungus problem with a specific design of IR glass. Sinar switches from this particular glass, and bingo no more problems.
Hasselblad had no such know problems up till the full 645 22 mpx chip's glass. Then the problems started to show up in certain conditions. I however do not know if they switched IR glass design or supplier. With a new design that uses a lens type multicoating the issue may be once again gone.
This does not seem to be a pattern that is controlled only by shifting moons & car vandals. It is also an issue that should not be beyond the wiz bang engineers of the manufactures.
Ah yes. The random, unpredictable nature of life. You could be right. Maybe that car damage was just a set of random and coincidental occurrences. I'm sorry I brought it up now.
Maybe the optics with fungus problems, that I've seen over the past few decades, were the result of a complex combination of random circumstances triggered by some specific conditions.
The questions that would be really interesting to ask and answer would be:
- How does a fungus spore attach to a surface?
- What is needed for a fungus spore to germinate and grow?
- What is required to sustain growth?
- Why do attempts to eradicate an established colony generally fail in the long term, resulting in eventual regeneration?
- What is known about fungus growth on optics?
- Is there a consensus of expert opinion on what optical materials may or may not contribute to creating favorable conditions for fungus growth?
- Are all optical surfaces vulnerable? Are some more vulnerable than others?
Let us know if you have any answers.
I'll add my own observations when I get up the energy, mood and time. Too many things that I consider more important than this right now.