I know dust in the front and rear elements barely affects the photo but what the heck is this??? I recently got this from the latest refurb sale from Canon's website. Its not your usual piece of dust but some kind of crud....glue maybe?
So....two part question:
1. Does this affect the photo since its much larger than a piece of dust?
2. Would you go through the hassle of sending this lens back to canon hoping they would exchange it? (I wonder if Canon would pay to ship it back?)
Any one else have this kind of experience with Canon Refurbished or have this same crud in their lens?