I was out taking pics today when what i can only describe as an earwig or simular walked across the end of my lens i went to knock it off but there was nothing there, i was taking pics again when across it walked again, so when i got home i took my lens off over the bath as i though this would be better to see if it fell out, but nothing came out,so then i locked my mirror up and gave it a good blow with the rocket blower but nothing again, has anyone any thoughts on where it might be and could this cause damage, i will also mention that this morning i bought the lens new from wilkinsons a Canon 17-85 is it possible it could be in the lens any help/advice would be appreciated thank you...Ray