I bought a 28mm 2.8 from someone (a used minolta maXXum <---lol double x) and when it came, there are like 3 "things" on the inside of the outter lens. The only way to describe it is that they look like "sparkles" or "glitter". Is this dust? They don't come off with blowing or a soft cloth so it's definately inside the lens. I hear people talking about dust on the lens all the time, but I have no clue if this is what it looks like when it's inside the lens...or will it actually look like dust? Could it just be imperfections in the glass on the lens? I have no clue and I'm thinking maybe I should send it back and get a refund. I'm just afraid that it is going to effect my pictures...any ideas?