Anybody has an idea what this is ?

[Will S.]

I just receive this second hand lens on Friday but I noticed there is something inside the lens observed at distance about 10cm. There is no mark on front and rear element. It seems these stuff is on one or more element inside the lens.

 

[Bob]

Those sure LOOK like scratches.
In any case, it looks bad enough to affect the quality of images IMO.
OTOH, try it out, you might like the look for special uses.
I would be wary of flare.
If you don't like the images it takes, see if you can send it back.
-bob

 

[mazor]

I think it could be some sort of fungus! either get it cleaned or send it back?

MAzor