I bought a used Sigma lens on ebay for my back up camera and it was said to be in "mint" condition. I got it today and look it out of the box to look at it and I was horrified to see that the front glass looks like it has frost inside it! Is this fungus? I have never had or seen fungus before. 
If this is fungus can it contaminate my camera or infect my other lens if I switch them out?
Answer
The photograph looks like dust, but if you say it looks like snowflakes then yes, that is a fungus. See http://forum.mflenses.com/fungus-on-lens-t1301,start,105.html for examples and send that lens back/complain!
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