I have one that looks like it has some growing *inside, between the elements.
I guess waterproof doesn't mean 'Airtight', but what funguses grow in argon?
Aren't these things supposed to be sealed?
I'm happy to pull apart to clean as I have the tools, but I wonder also if, like with the lens cell of an apo, there is a risk of 'decollimating' the EP through axial movement or rotation?
Anyone care to chip in?