My Helios-44-2 seems to have fungus inside. The aperture blades are pretty oily, so to my untrained eye it might also be oil that has settled on the glass, instead of fungus.
1. How fast does fungus spread? This lens has been like this for about a year, and I havent noticed the stuff on the glass spreading. Its been kept in the dark mostly.
2. Is it safe to use this lens on a camera? I havent noticed any quality loss to the images with this stuff on the glass. Can this lens "infect" other lenses, which are used on the same camera, aswell?
3. What does it look like when there is oil on glass?
4. Any tips or instructions on taking this thing apart? Its not a real loss if I brake it.