Fungus in Unused EF 100-400mm Lens?

[Cajun]

I recently was trying to sell a lens that is brand new. (Canon EF 100-400mm f/4.5-5.6L IS II USM)

I purchased it in February of last year (11 months ago) and never used it. I never even took it out of the bag it came in, plastic it came in, or box it came in. I just never got around to using it like I thought I would... sadly..

Not going to name any companies, but I went to sell it online after having little success with FB marketplace.

They offered me $550 because theres a spot of "fungus" dead center on the glass. 

Has anyone ever heard of this? I understand if I were to have used the lens, brought it out in the elements, and put it through the wringer but none of my other lenses have ever had this issue. 

I just cant bring myself to believe this, but maybe someone has heard of this and can shed some light on this.

Thanks!

[Cajun]

The whole thing is odd haha, its never touched air. I put it on a shelf in the box that it came in, and boom, it now has fungus a year later. Doesnt make sense but hopefully I can get some answers out of talking to canon. 😄

[Ron888]

When i said fungus spores are everywhere i wasnt kidding😄

[ebiggs1]

Well every story has details that are not known or let be known or perhaps even remembered. Call Canon 1 (800) 652-2666. You will need your receipt when you call.