How to tell if lens has fungus or simply a lot of dust?


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hobbes187

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Apr 3, 2007
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#1
Hi all,

I was wondering how to tell the difference between fungus and dust particles? Cos after viewing some 2nd hand lens, when I look into the lens against a bright light with aperture wide open, I usually see specks and particles inside.

Problem is how to differentiate dust particles crowding together and fungus? Anyone has images of the 2?
 

Rashkae

Senior Member
Nov 28, 2005
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#2
Do a search here. This has come up many times. Or a google search for "lens fungus" will help you too.
 

hobbes187

New Member
Apr 3, 2007
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Singapore
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#4
Hmmm... I see some dust has roots also if you turn the manual focus ring to focus on them... From far they look like a speck though...
 

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