Question about Canon (12x36) IS II Binocular

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Pattern appeared on interior of lens/prism

My Canao 12X36IS binos were stored for a season (indoors. When using them for the first time, I noticed a pattern like etching or dried condensation on when looking through them. It seems to be on the prism or lens interior surface. Any sugestions on how to fix. Is this just a cleaning issue?

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What you see is fungus . It comes off very easily BUT if allowed to grow it will damage coating and glass because the organism releases hydrofluoric acid. So the key is to clean as soon as possible. You can do this your self but be careful around the prisms because even slight movement here will upset your collimation ( will get 'double image')and then you will need to have your nbinocs aligned properly.

Posted on Sep 15, 2007

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