I just received a Canon 100-400mm from a sale on fleabay. It appears on close inspection to have about 3 dust spots on the top left of where the glass narrows inside the lens. I know about the 100-400 being called the dust pump but what I want to ask is are the dust specks really a problem to image quality?
If not I will just leave it but if they are I might email the seller as it wasn't described as having dust speck inside the lens. Other than that it seems like a nice lens.
I'm not trying to scam the seller or be over picky I am just interested to know what effect the dust has and if you guys think I should do anything about it.