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07-05-2017, 09:05 PM   #1
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Fungus on Prime

I was looking at a Zeiss 50mm 1.4 lens today, and wonder if it is worth the low price. It's a bit beat up, with some nicks on the body, and a few small scratches on the glass. It also has a little fungus on the front, around the rim. Being a prime, it must be easy to take apart a clean, but will the cleaning remove the fungus?

07-06-2017, 05:25 AM   #2
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If the fungus is on an outer surface, cleaning will remove it although there may be a faint ghost of the fungal tracery where it damaged the coating and the surface is a bit more reflective.

If the "fungus" is really deterioration or delamination of the cement between two elements, then the repair involves a bit more work to fully separate the elements, remove the old cement, and recement them.

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