Question about Mamiya Macro 140mm f/4.5 L-A for RZ67
If it's mild then it won't have any appreciable effect on your photographs, so leave it until it's worse. The fungus can be slowed or killed by sunlight or by exposing the lens element to ultra violet light.
If it's really bad then you have to decide whether it's worth a professional strip down and clean. You'd have realistic two choices: to remove the fungus and replace all lubricants and canada balsam lens cement with modern antifungal equivalents but leave the damaged lens coatings as they are or to do the same and also have affected lens groups replaced with new ones or have the old ones re-coated. The first option is expensive, the second option is very expensive.
Posted on Aug 01, 2009
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Posted on Jan 02, 2017
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