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'Crystals' inside my Canon EF 100mm Macro USM Lens

Started Apr 28, 2015 | Discussions thread
Nigel Richards Junior Member • Posts: 37
Re: 'Crystals' inside my Canon EF 100mm Macro USM Lens

Coming late to this thread, its fungus, I buy a lot of lenses in the UK  and see fungus in lenses on a regular basis, get it cleaned before it etches the glass.

I get the impression thats its usually caused by a storage issue.  Probably it was already there when you checked the glass.

Good luck

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