Question answer

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Comments: 8 582, on the topic: Question-Answer

  • Igor

    Good evening. Can you kindly tell me what a terrible fungus is on the lens?

    • Rodion

      In general, it depends on the degree of damage and the degree of accessibility of the lens for cleaning. If these are, say, isolated outbreaks that occupy a small area of ​​the total surface area, it’s not particularly scary. But the fungus has a tendency to grow, so it is best to either neutralize it with a long exposure to mercury UV (if there is no access to the lens; the method may be ineffective if there are flint lenses in the optical path) or clean it off (there are different methods, their applicability depends depending on the circumstances, in particular the type of coating of the optics).
      If the damage is extensive (>10% of the area), pronounced (thick film), then there is a chance that the anti-reflective coating or even the top layer of glass is damaged - such a lens is not worth taking, it’s a lottery. Let me explain: I cured my OKS1-300-1 of fungus so that not a single trace remained, but with Sonnar 4/300 T such a trick is no longer so effective due to different types of coatings and different brands of glass (less chemically resistant in Sonnar ).

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