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I dropped off my 70-200 2.8 mark 1 for servicing at Canon NJ and have been told there is fungus in the IS component which will need to be replaced at a cost of $465 ( with cps discount )

They say it's minimally affecting the elements but could get worse ( as fungus tends to do )

has anyone ever heard of this happening?

would you say it's worth repairing or should i use the money to buy a new one?

anythng else i'm not asking that i should be?

btw..i shoot professionally. Up until now..i have found this to be one of my sharpest lens, keeping me from wanting to upgrade to a mark II

Thanks...Arnie