Is this fungus?

fuzzywuzzy · Expire: 2013-11-30

I recently got a Schneider-Kreuznach Durst Componon 150/5.6 bundled with some other things. I don't know what mount it originally had, but now it's got a M42 thread glued onto the back. It also has a big ol' blemish of some kind on the inside of the rear element.

It doesn't have the fibres/threads I'd expect to see, and it's very shiny in the right light, I'd almost think it was a chip in the glass but the edges are sort of rounded?

Very shiny when the right catches it at certain angles

taken with bellows Tak 100/4 at full bellows extension, 100% crop

The lens is pretty unwieldy on a SLR, the bellows needs to be extended about halfway for the thing to reach infinity Laughing

The pictures have nice colours but are a little soft, no surprise with that shiny blob on the rear element.

Drack · Joined: 27 Feb 2011 Posts: 735 Location: Lithuania

To me it looks like someone has spilled glue , grease , paint or something similar. I don`t think that it`s fungus trough. Try using a micro fabric cloth and some cleaner or alcohol to wipe it off.

GrahamNR17 · Expire: 2012-09-06

Could it be an odd creeping shape of an air bubble between two bonded elements? certainly looks very curious, and not at all fungus-like.

Attila · Expire: 2025-11-18

Not fungus for sure.

fuzzywuzzy · Expire: 2013-11-30

Smoli4 · Expire: 2013-06-07

if its indeed separation, i would be glad to take a look ofc in case that you would like it fixed or it impact image contrast etc..