TS replyed today:
If the fungus is between the lenses, that's pretty complicated. You have to disassemble the lens for cleaning. So write down which lens is in which position and orientation in the frame. Try cleaning with alcohol first. That tolerates the glass and also the remuneration. I once read that acetic acid should help. So put the lentils in dilute acetic acid and let it work. The effect can be increased by slightly warming the acetic acid. But she can't cook! This is not supposed to be that good. I didn't try it myself, so that's at your own risk. The mushroom doesn't like UV light either. Unfortunately, the UV antile of the sun is far from sufficient. Then after successful cleaning the lens has to be reassembled and adjusted. Adjustment is only possible with a lot of experience and the best thing is to have an optical bench at your disposal. Companies such as By the way, Zeiss and Leica do not accept fungus-infested optics for cleaning. We shouldn't do that either. Regards Max
I just wonder if the fact that humidity was ever able to get in to the lense cell is due to bad manufacturing in the first place.. but that's just my opinion.
I think my friend will return it to the guy who sold it to him. Quite an unfortunate situation all around.
Thank you all for the replies it is much appreciated.
Cheers and clear skies!!
Edited by Danny778, 09 July 2020 - 02:49 AM.