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Oh man, really feel for you Bojan. What a disappointment, let alone the problems from looking more closely at it. I hope there's a Canon lens guru here, or at least a recommendation for someone that could help.
If you're only doing astrophotography you may not even need the iris mechanism? Could be better to stop down externally with rings or something else, assuming you can safely reach the fungus and deal with it satisfactorily.
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