Hi, I have a circa 1990 K1000 body that is mechanically fine, but at some point in the last 5 years of storage (mostly in a desk drawer or a camera bag) it has developed some sort of internal fungus that is not on any lens, not on the flip-up mirror, and not on the or the underside (easily visible side) of the focus screen inside the camera.
I've included a picture of the fungus as seen from inside the viewfinder here (taken from my K200D with a Sigma 28mm f/1.8 Macro lens). I'm going to guess it's somewhere between the focus screen and the viewfinder optics in the back of the camera, since it appears out of focus when the focus screen is sharp, and I can't make it out when I take my eye away from the viewfinder and look into it from a distance.
Is there anything I can (reasonably) do about it? Is it anything to worry about (other than the aggravation factor)? i.e. do I need to worry about lenses I hook up to this body 'catching' the fungus?
Thanks in advance for any info!