Thanks for the comment/advice. My concern is about the rapid growth of fungus in the humid environment. Naturally Japan is a country famously known for that, and many people use drying cabinets, etc to prevent anything to grow in their photo equipment.
Originally Posted by bob01721
I know sometimes it's ovekill to think about storing the photo equipment properly, but this is not the case. It's just too chancy to leave and/or use them just like how I used to.
So, where do I compromise when I see something inside the lens and it seems it's growing? I'm sure I need to clean it off. But will the lens cleaning leave any spots on the coating(s)? Are the spots going to be very visible/noticable? How much do they affect the images in both B&W and color? Will I be able to see them that in the enlargements like 16x20"?
The last time I used that Summicron lens was a while ago, and because now I live in a different place with different light, and using different enlarging equipment for my photos, I cannot really compare the results so critically.