The other day, Harris & I are setting up my Nikon 500 f4 to go to Bear Point, and I notice the plastic liner for my lens hood is "loose", so I take it out. Seems it's just a shipping protector for the felt lining of the hood. I've shot with this clear plastic liner in there for months! Has this had any adverse effect on on my shots, if so, what? I feel like such a Dufus for not noticing this sooner!