Okay - I got the Canon 50mm. 1.8 two days ago, did a shoot with it and was really happy! Ended up noticing a speck on the lens so cleaned it and was peering at it under a brighter light. I can see minute specks or bubbles (??) in the glass INSIDE the lens...I can see them from both sides of the glass, and from both sides they are beyond the exterior lens. Is this normal? I don't notice anything glaringly wrong in my shots, so I don't think is effecting my pics, even took a pic of the white wall and it seemed alright. Is this perhaps the nature of lenses?